rm ahmedabad 2005
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Revenue Management
Vision 2020: Ahmedabad 2005
Peter C. BellWs [email protected]
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My Objective
To introduce you to the practice and theory ofRevenue Management
Since this is a large and fast growing field, this will be a
broad-brush survey.
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AGENDA:
Introduction What is revenue management, who uses it
and what has been the impact?
The five pillars of RM Pricing, discount allocation, overbooking, trading up
and re-planing
Integrating the tools Conclusions
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AGENDA:
Introduction What is revenue management, who uses it
and what has been the impact?
The five pillars of RM Pricing, discount allocation, overbooking, trading up
and re-planing
Integrating the tools Conclusions
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REVENUE MANAGEMENT: Definition
Revenue management (RM) is the
science and art of enhancing firmrevenues while selling essentiallythesame amount of product.
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REVENUE MANAGEMENT: History
The first reference to RM is:
Taylor, C.J. (1962) The determination of passenger
booking levels. Proceedings of the Second AGIFORSSymposium, American Airlines, New York.
This work recognizes the value of selling moreairline seats than capacity in anticipation ofno-shows. We now call this overbooking.
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REVENUE MANAGEMENT: History
The first major users ofRM wereAmerican Airlines and Delta Airlinesstarting about 1985.
Both Tom Cook (American) and Robert
Cross (Delta) have been cited as thefathers of corporate RM.
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OR developments in revenue
enhancement since 1985 have ledto innovative new methods of pricing
and delivering products.
We call these methods revenuemanagement tools.
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MANAGEMENT SCIENTISTS
HAVE WRECKED THE AIRLINEINDUSTRY
Joseph F. Coates(California futurist)
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However the impact of revenue
management has been dramatic
and the use of RM continues toexpand to new products.
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We estimate that yield management hasgenerated $1.4 billion in incremental revenue in
the last three yearsby
creating a pricing structure that responds todemand on a flight-by-flight basis
R.L. Crandall, Chairman and CEO of AMR, 1992
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We have estimated that the yield managementsystem at American Airlines generates almost$1 billion in annual incremental revenue
Tom Cook, President
SABRE Decision Technologies,
June 1998
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"Ford Motor Co. has quietly been enjoying ahuge surge in profitability... 1995 and 1999,
U.S. vehicle sales rose just 6 percent, from3.9 million units to 4.1 million units. Butrevenue was up 25 percent, and pretax
profits soared 250 percent, from about $3billion to $7.5 billion. Of that $4.5 billiongrowth, Ford's Lloyd Hansen, controllerfor global marketing and sales, estimatesthat about $3 billion came from a series ofrevenue management initiatives.
CFO Magazine, August, 2000
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(revenue management) basically saved NationalCar Rental. And you can go from the CEO of
National on down, and they will all say: justapplying these OR models made the life or death
difference for this company
Kevin Geraghty, Aeronomics Inc.
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and .. on the other side:
RM used by the competition has bankruptedseveral corporations .. the clearest examplebeing Peoples Express Airlines.
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Donald Burr, Founder and CEO of PeopleExpress
believes that major carriers use ofsophisticated computer programsto immediately match or undercuthis prices ultimately killed PeopleExpress
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WHO USES RM?
AIRLINES (All?)
HOTELS (Hyatt, Marriott, Hilton, Sheraton, Forte, Disney ..)
VACATIONS (Club Med, Princess Cruises, Norwegian ..)
CAR RENTAL (National, Hertz, Avis, Europcar ..)
WASHINGTON OPERA
FREIGHT (Sea-Land, Yellow Freight, Cons. Freightways ..)
TELEVISION ADS (CBC, ABC, NBC, TVNZ, Aus7 ..)
UPS, SNCF
RETAIL (Retek, Khimetrics) REAL ESTATE (Archstone)
NATURAL GAS
TEXAS CHILDRENS HOSPITAL
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AGENDA:
Introduction What is revenue management, who uses it
and what has been the impact?
The five pillars of RM Pricing, discount allocation, overbooking, trading up
and re-planing
Integrating the tools
Conclusions
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THE 5 PILLARS OF RM
New approaches to pricing Discount allocation
Trading-up
Overbooking
Re-planing
+ markdown optimization, purchase loans, etc
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NEW APPROACHES TO PRICINGPRODUCTS AND SERVICES
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THE NEW PRICING CONCEPT
Use product price as a managementcontrol variable.
Set this price optimally to variouscustomer groups or clusters.
Be prepared to change prices often.
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THE CONCEPTUAL LEAPS
Products do not have a value, rather thevalue of a product depends on the point intime of purchase.
Products have different values to differentclusters of customers.
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DEMAND AT A POINT IN TIMEBY ACUSTOMER CLUSTERDRIVES RM PRICING
MARKET SEGMENTATION IS THE KEY TO
ENHANCING REVENUES THROUGH RMPRICING
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Price
Quantity Sold
A MARKET
Q = F(P,..)
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Price
Quantity Sold
SEGMENTING A MARKET
Market
Segmentation
Q = F(P,..)
becomes qi = Fi(pi,..)
for i = 1,N
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MARKET SEGMENTATION: METHODS
Time of purchase
Customer characteristics (seniors, others)
Sales channel (clicks and bricks) Offer a discount to large customers
Offer a discount for slow delivery
+ +
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Example of market segmentation
Coke price rises with heat
Vending machine that alters price with temperature
change is possible
NEW YORK (CNNfn) - It's not the New Coke, but it maybe the Smart Coke. Soft-drink giant Coca-Cola Co. isworking on a vending machine that automaticallyraises the price of a soda whenever the weather growshot.
Coke chairman Doug Ivester said the machine wasdesigned to reconcile supply and demand by raisingthe price when demand increased.
"Coca-Cola is a product whose utility varies frommoment to moment," he was quoted as saying.
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CLUSTERING CUSTOMERS
Different groups of customers value a product
differently Example:
Business class air customers value
convenience, comfort, flexibility Economy class customers value low
prices, (and perhaps longer stays,
advance reservations) Clustering means assigning customers to
clusters or market segments
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An example of clusters
E-Bivalent Newbies (5% of online shoppers) Newest to Net, somewhat older, spends least online, likes online
least Time Sensitive Materialists (17%)
Most interested in convenience, less likely to read reviews orcompare prices
Clicks and Mortar(23%) Browse online, prefers to buy offline, more likely female, has
privacy and security concerns, goes to malls often
Hooked, Online and Single (16%) More likely young, single males with high incomes, have beenon Net longest, most likely to play games, download, bankonline
Hunter-Gatherers (20%) Typically 30-49 years old, two kids, most likely to visit sites that
provide information and comparison Brand Loyalists (19%)
Most likely to bypass search engines to go directly to sites theyknow, most satisfied with shopping online, spend most online
-- Harris Interactive study of 3,000 Internet Shoppers, 2000
CHANGING PRODUCT VALUE
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CHANGING PRODUCT VALUEOVER TIME (time segmentation)
Perishable products that age,
Seasonality,
Some customers will pay for the security ofearly purchase, or for the flexibility of latepurchase,
Suppliers may attach value to the security ofearly sales.
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Demand
Time
CHANGING DEMAND OVER TIME
Example: PERISHABLE PRODUCTS
Segment 1 S2 S3
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Demand
Time Event Date
CHANGING DEMAND OVER TIME
Example:EVENT or TRIP TICKETS
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Demand
Time Event Date
CHANGING DEMAND OVER TIME
Example:EVENT or TRIP TICKETS
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Common Demand Models
Q = Quantity sold
p = price/unit
Linear demand:
Q = A B p
Usually maximum and minimum prices are specified
Constant elasticity demand:
Q = A p-e
where e is the price elasticity of demand
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Price
Quantity Sold
Demand Curve
Linear Approximation
LINEAR APPROXIMATION OF DEMANDCURVE
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MODEL CHOICE MAY NOT BE OBVIOUS
Q = 92.1 - .37 P R2
= 0.95 Q= 2170037377 P-3.59
R2
= 0.95
DEMAND EQUATION ESTIMATION
0
10
20
30
40
50
60
70
$100.00 $150.00 $200.00 $250.00
Price
Qu
antity
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General Demand Function
In general, for any time period and cluster:
Q = F(P, Ps, Pc, X1, X2, .)
where: P = price of product
Ps = price of substitute products
Pc = price of complement products Xi are exogenous variables (weather,
economic factors, advertisingetc)
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Estimating Demand
Demand estimation is a craft: firms tend to keepthis part of their RM confidential.
Two steps are required:
1. Build a demand model (off-line). Commontechniques include regression, curve fitting,and cluster analysis.
2. Develop an on-line demand model updatingprocedure to respond immediately tounexpected observed demand.
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LEAKAGE
Demand leakage (from a high pricedsegment to a low priced segment)
occurs when segmentation is notperfect.
Q1 = F1(p1) L(p1 p2)
Q2 = F2(p2) + L(p1 p2) where p1 > p2
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FENCES
Revenue will disappear unless marketsegments are kept separate to limit leakage
from high priced segments to low pricedsegments.
Tools to maintain segment separation arecalled fences.
Examples of fences: The fee airlines charge to modify a low fare ticket
(usually $150-200).
The requirement for a Saturday night stopover for alow fare ticket.
Booking and paying 90 (or 60, or 30) days inadvance.
Look for examples of creative fences!
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Pricing
Approaches to Revenue Maximization
Traditional fixed pricing
Variable pricing Optimum dynamic pricing
Computing optimum prices
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Price
Quantity Sold
Single price: 2 market segments
p
Q1 Q2
Revenue = p (Q1 + Q2)
There is usually a p* thatoptimizes revenue.
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Price
Quantity Sold
Two prices: 2 market segments
p1
Q1 Q2
p2
Revenue = p1Q1 + p2Q2
If p1* and p2* maximize revenue
then:
p1*Q1 + p2*Q2 p*(Q1 + Q2)
Formal statement of deterministic ODP
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Formal statement of deterministic ODPproblem (time segments)
Let: pi be the product price in period i,
qi
be the quantity sold in period i,
qi= fi(pi) be the demand curve for period i,and
Ibe the inventory to be sold over Npricingperiods.
then:
Max
Subject to:
qi= fi(pi) for i = 1, ......N
i
N
ii qpZ
=
=1
Iq iN
i=
=1
Deterministic ODP problem with forecast
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Deterministic ODP problem with forecasterrors
Let: pi be the product price in period i,
qi be the quantity sold in period i,
qi= fi(pi) be the demand curve for period i, and
Ibe the inventory to be sold over Npricing periods.
then:
For each period, k, k = 1,2,...N
Max
Subject to:
qi= fi(pi) + error fori = k, k+1, ......N
i
N
ki iqpZ ==
==
=1
1
k
i ii
N
ki
qIq
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ACCEPT/REJECT DECISION MAKING
RM algorithms are mostly accept/reject rules.
If a customer appears and offers to buy a unitfor $P, do you accept (in which case you giveup the opportunity to sell the same unit to a
later arriving customer who may pay morethan $P), or do you reject (in which case yougive up $P in the hope of selling the unit later>$P but may not sell the unit).
The issue is one of balancing yield loss and
spoilage.
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Revenue optimization drove the entry of RM intoservices.
- non-replenishable inventories,
- low (zero?) variable cost of providing product.
For restockable items, contribution optimizationcan be more difficult.
- role of inventory and replacement policies,
- need for profitable market share.
The Single Period Stochastic Optimum
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The Single-Period Stochastic OptimumPricing Problem
Define: p - the price (a decision variable), c- the variable production cost (c
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Inventory/SC models vs. RM models
Most inventory and supply chain modelsassume demand (Q) is given.
RM models replace given demand (Q) with a
given demand curve [F(p)]. The firm mustoptimizep (and hence determine Q) andsimultaneously optimize inventory.
Many research opportunities.
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THE 5 PILLARS OF RM
Optimum dynamic pricing Discount allocation
Trading-up (or planned upgrades)
Overbooking
Re-planing (or short selling)
+ markdown optimization, purchase loans, etc
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Discount allocation: Solver example
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Discount allocation: hotel example
DYNAMICS OF MULTIPLE DISCOUNT
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DYNAMICS OF MULTIPLE DISCOUNTPACKAGES AND PRICE CATEGORIES
Issue: If a customer appears and demands thelow fare or discount package, when do yousay No in order to preserve product for thehigher paying customers?
Example: How many full fare economy seats
on the plane?
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Reservation rule (Littlewood 1972)
Issue: How many units (seats) to reserve forlow price sale?
Continue to sell discount product at time t until:
r
(1 - Pt) R or (1 - Pt)
r / R
Where: r = low price (marginal revenue)
R = high price (marginal revenue)Pt = probability of selling at leastthe remaining number of units.
EMSR Heuristic (Expected Marginal Seat
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EMSR Heuristic (Expected Marginal SeatRevenue) Belobaba 1987
Apply Littlewoods rule sequentially to fare classes inincreasing fare order.
Let i ,i be the estimates of mean and std. deviation of demandfor product class i with price pi
Set a reservation (or protection) level of Li so that
pi+1 = Pi P(Xi > Li)
Where Pi is the weighted average fare for classes 1,2,,,,,I
And Xi is a normal random variable convoluting demand forclasses 1,2,.i
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Protection levels: Expected MR curves
O b ki ( k lli )
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Overbooking (aka overselling)
Issue: Should you take more orders than you
have product in the expectation that somecustomers who have ordered will not collectthe product?
If so, how many extra orders should you takeand when?
P{cancel order} declines as delivery dateapproaches
OVERBOOKING EXAMPLES
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OVERBOOKING: EXAMPLES
airline seats, and passenger train seats, are usuallybooked in advance of the date of travel,
rental cars can be reserved ahead of the day of rental,
hotel rooms and campsite spaces, seats for stageshows, sports events, and concerts are sold in
advance, fresh turkeys can be ordered for delivery at
thanksgiving,
package vacations and cruises are usually booked in
advance, tuxedos, cut flowers, some baked goods, etc. are
commonly booked for future delivery
M i th b k d t
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Managing the overbooked customer
A key cost in all the models
Airlines offer cash or travel coupons to
ticketed customers in order to persuade themto take an alternate flight when space isneeded for overbooked passengers.
Hotels will trade up overbooked customers torooms on the executive floor,
Rental car companies will substitute a higher
class of car at no extra charge.
In all these cases, the cost is well know.
Mi i i i th h t
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Minimizing the no show rate
If all customers with reservations showed up,there would be no benefit from overbooking
Require payment at the time the booking is made,
perhaps offering an early payment price reduction. Require payment in full at some prearranged time in
advance of the delivery date. If payment is notreceived, the supplier cancels the booking.
Fees may be charged if a booking is changed.
O b ki th b i d l
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Overbooking: the basic model
M = the amount of product
B = the booking limit (B M)
RN = the value of sale of unit N with RN+1 RN,
Ci = cost of satisfying the ith overbooked customer if no product isavailable, Ci+1 Ci
P[Q|B] = probability that Q customers will show up if we sell B units.
The expected cost of unsold product is:
{(RQ+1 + RQ+2 +...+ RM) P[Q|B] } summed over all values of Q < M
The expected cost of handling oversold customers is:
{(C1 + C2 +...+ CQ-M) P[Q|B] } summed over all values of Q > M
Find B that minimizes the sum of these two expected costs.
O b ki D t i i th ti l l l
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Overbooking: Determining the optimal level
T di ( l d d )
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Trading up (planned upgrades)
Issue: If a customer appears demanding aproduct that is sold out, should you trade thecustomer up to a higher valued product (at
your expense)?Issue B. If you adopt this as policy, what does
this do to your inventory management?
Re planing
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Re-planing
Issue: If a plane is sold out several days beforeflight date and a customer appears preparedto pay a high price for that flight, can you
profitably incentivize a low-fare paidcustomer to change flights?
2001 McKinsey, CALEB Technologies,American Airlines
Other RM tools
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Other RM tools
Markdown optimization is common in retail(Retek, Manugistics, Spotlight): This is really
price optimization with non-increasing prices. The benefits are claimed to be very
substantial
Bottleneck optimization (Maxager Tech.) isprice optimization where inventory isproduction time on the scarce production unit.
There are others but all seem to be variationson the 5 basic tools.
AGENDA:
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AGENDA:
Introduction
What is revenue management, who uses itand what has been the impact?
The five pillars of RM Pricing, discount allocation, overbooking, trading upand re-planing
Integrating the tools
Conclusions
Integration
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Integration
Although these tools are almost always
discussed separately, they all function withina highly integrated system
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PRICES
RESERVATION LEVELS
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PRICES
RESERVATION LEVELS
CAPACITY
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PRICES
RESERVATION LEVELS
CAPACITYOVERBOOKING LEVEL
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PRICES
RESERVATION LEVELS
CAPACITYOVERBOOKING LEVEL
PLANNED UPGRADES
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PRICES
RESERVATION LEVELS
CAPACITYOVERBOOKING LEVEL
PLANNED UPGRADES
REPLANE
LEVEL
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PRICES
RESERVATION LEVELS
CAPACITYOVERBOOKING LEVEL
PLANNED UPGRADES
REPLANE
LEVEL
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Product SalesHistorical Data
Build
Demand Model
Update
Database
Revise Demand
Model
PricingSystem
Real time
Sales Data
Current
Demand
Forecasts
Revenue Management
System
Inventory
Levels
Off-line Support Activities
The
Market
Posted Prices
REQUIREMENTS FOR SUCCESS
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REQUIREMENTS FOR SUCCESS
SUPERIOR INFORMATION TECHNOLOGY,
SUPERIOR OPERATIONS RESEARCH SKILLS,
and
THE ABILITY TO MANAGE DYNAMIC PRICES.
AGENDA:
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AGENDA:
Introduction
What is revenue management, who uses itand what has been the impact?
The five pillars of RM
Pricing, discount allocation, overbooking, trading upand re-planing
Integrating the tools
Conclusions
BUSINESS OPPORTUNITIES
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BUSINESS OPPORTUNITIES
A great number of products seem ripe for RM.
Some examples:
Cinemas, golf courses, electricity, taxis, publictransit, newspapers and magazines,advertising, fashion clothing, blue jeans,vegetables, fast food, supermarkets, sports
events, theatre, pop concerts,
RESEARCH OPPORTUNITIES
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RESEARCH OPPORTUNITIES
Academic
Almost every inventory model can be extended
to include a demand curve (some alreadyhave been!)
Accept/reject decision heuristics (Bayesian)
ApplicationThe merger of SC optimization and RM (EPO)
Clustering
New and improved fencing
Demand modeling (how good does it need tobe?)
CONCLUSIONS
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CONCLUSIONS
RM tools have become very important for bothbusiness and OR
There are opportunities for many new revenuemaximizing models and pricing/inventorymodels
Heuristics to aid implementation are a priority
Competitive models provide an opportunity
The competitive customerCompetition among RM firms
CONCLUSIONS
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CONCLUSIONS
RM techniques raise many business issues:winning firms will be able to implement theseideas while keeping customers (and
regulators) happy.Everyone gains from the efficiencies that RM
produces, but some individuals lose.Successful implementation usually requirestaking good care of the few who lose.
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