Cost & Revenue Functions
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1 1.11 Project Evaluation Cost & Revenue Functions Topics Breakeven volume for making a profit (if prices are known and you are a "price taker") Identifying a range of prices for which you can make a profit (assuming that demand varies with price) Choosing prices to maximizing profit Supply/demand/equilibrium - an overview Present economy
2 Conditions for Profitability- Simple Linear Cost & Revenue Functions Cost = a + bv Price = P Revenue = PV Profit = PV - a - bv = (P-b)V - a Breakeven Volume = a/(p-b) Conditions for Positive Profits: Price > variable cost Volume greater than breakeven volume
3 Breakeven Volume for Profitability Breakeven point P is where TR = TC 2 Total Cost Revenue Cost TC = 5 + V Revenue = 1.5 V Loss P Profits Volume
4 In General, Volume Varies With Price: The lower the price, the higher the volume 25 Price Volume
5 Total Revenue Also Varies With Price: Revenue Declines if Price is Too High or Too Low 5 Price or Revenue Revenue Price Volume (Demand) for the Given Price
6 Maximizing Profit is not the Same as Maximizing Revenue 5 Max Revenue $ Max Profit Revenue Cost Volume (Demand) for the Given Price
7 Maximizing Profit is not the Same as Maximizing Revenue 5 Max Revenue When V = 4 4 $ 3 Max Profit When V = 3 Revenue Cost 2 Profit Volume (Demand) for the Given Price
8 A Company Will Produce Only if its Expected Market Share Will Allow It to Make a Profit for Some Range of Prices 5 Revenue $ Potentially Profitable Cost Volume (Demand) for the Given Price
9 If costs are very high, then a company will be unable to make a profit for any range of prices 1 Revenue $ Cost Total cost always exceeds total revenue Cost Revenue Volume (Demand) for the Given Price
10 Prices Reflect an Equilibrium Between Supply and Demand Price Demand Supply Supply Demand Equil. Price Volume (Demand or Supply for the Given Price)
11 Investment may allow suppliers to offer lower prices, increasing volume (a movement along the demand curve) Price Demand Supply New Supply Supply Demand New Supply New Equilibrium Price Volume (Demand or Supply for the Given Price)
12 Population Growth, Advertising, Higher Incomes, or other Factors May Cause an Increase in Demand (a shift in the demand curve) 5 New Demand Supply Supply Price Equil. Price Demand New Demand Volume (Demand or Supply for the Given Price)
13 How Does the Equilibration Work? If demand increases, and there isn't enough supply, then prices rise (or, in the case of some types of infrastructure, congestion and service delays get worse) If prices rise, then suppliers make more profits and are willing to increase production If production increases, then there may be some producers willing to cut prices to get more market share If demand declines, then prices drop and inefficient producers leave the business
14 Prices Reflect an Equilibrium Between Supply and Demand Price We probably only know a little about supply & demand Supply Demand Volume (Demand or Supply for the Given Price)
15 "Present" Economy A "present economy" study seeks to change the supply function by improving the production capabilities of the organization The term "Present" is used to indicate that we don't have to worry about expenditures over a long time horizon All costs and revenues are therefore in the same "current" dollars With a better supply function, we may be able to underprice competitors or create a new, profitable service
16 Cost Driven Optimization A basic design question may arise when some costs vary directly and others vary inversely with a particular, important design parameter (which is known as a "cost driver") Example 2-9 in Eng. Economy: How fast should a scheduled aircraft fly? Time is inversely proportional to speed Cost increases with speed raised to the 3/2 power Create an equation of total cost (actually, just consider the costs that vary with speed) Use calculus to find the optimum
17 How Fast to Fly? Cost Operations = k v 1.5, where v is speed in mph = 4 mph so that k = $3/(41.5) = $.375 If passenger time is $3,/hr, then Pax time cost/flight = $3, (miles/v) TC = $.375(miles)v , (miles/v) d(tc)/dv = when 1.5 (.375) v.5 = 3,/v2 V* = 491 mph
18 How Fast to Fly? We are willing to spend more money to fly faster so long as the incremental value of time saved (and therefore the incremental price that we can charge the passengers) is higher) We can express our result as an equation: v* = [(Pax Time Value/hr)/k]2/5
19 Complicating Factors for Projects Long lives Demand can change substantially Competition from other suppliers and new technologies can be expected The time value of money becomes critical Externalities are important Unique projects Difficult to test supply & demand Equilibration takes place through what may be slowly evolving changes in land use and location decisions by firms and individuals
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