Unit 2 Flashcards
perfect symmetry
mode = median = mean
positive skew
mode < median < mean
negative skew
mean < median < mode
normal distribution: 1sigma, 1.96sigma
1s = 68%, 1.96s = 95%
why calculate future and present values
future flows are less certain (risk)
greater purchasing power (inflation)
greater flexibility if received today
- investors require additional return to compensate for delayed receipt
why calculate future and present values
future flows are less certain (risk)
greater purchasing power (inflation)
greater flexibility if received today
- investors require additional return to compensate for delayed receipt
Future value formula
FV = CF x (1+r)^n CF = cash flow r = growth n = time period
Single cash flow discount factor
PV (present value_ = cash flow at t_n /(1+r)^n
Single cash flow discount factor
PV (present value_ = cash flow at t_n /(1+r)^n
Present value of an annuity
PV = 1/r x [1-1/(1+r)^n]
perpetuity
infinite number of equal cash flows
PV at Time 0 = CF * 1/r
Continuous compounding
FV = CF * e^(rt)
Net present value (NPV)
present value of cash inflows - present value of cash outflows
+VE? worthwhile investment
-VE? not worthwhile
demand curve: the price effect
as price falls, leads to increase in quantity demanded
other influences on demand
Other influence (not price) leads to an inc in quantity demanded = shift in demand
price of other goods: substitutes (e.g. tea more demand when coffee price inc), complements (e.g. cream with strawberries)
income: normal goods, superior goods (buy more $$$ things when income increases), inferior goods
supply driven by
profitability. change in price moves us along the existing curve.
What shifts supply
costs, technology, natural factors, political factors or taxes
price mechanism
supply = demand: equilibrium
Elasticity measures
Relative change in quantity demanded
- Price elasticity - Cross elasticity - Income elasticity
elastic vs inelastic
elastic: demand changes more than price (-1 -> -5 ->): luxuries, non-essential goods and services
inelastic: demand changes less than price (-1 -> 0): food, household, personal care (necessities)
unitory elasticity of demand
when elasticity = -1
Cross elasticity
change in quantity demanded/change in price of another good (substitute/complementary)
+ve = substitute goods
-ve = complemetary goods
Income elasticity of demand
Price/income
Normal goods e.g. cars/TVs: positive
Saturated goods e.g. toothpaste: nil/zero
Inferior goods: negative
Revenue
Costs
Profits
Revenue = sales: amount a firm earns from selling its output (price x quantity)
Costs: outgoings associated with production of goods for sale
Profits: revenue minus costs. economists assume firms make decisions to maximise profits
marginal revenue
additional revenue gained by selling one additional item
change in revenue/change in quantity
average revenue
price of one item. total revenue/quantity
factors of production
land and raw materials: rent
labour: wages
capital: interest rates
entrepreneurship: director salaries
average total cost
average fixed cost + average variable cost
average fixed cost vs average variable cost
average fixed cost: constantly declines in price as quantity dec
average variable cost: cost declines and then increases as quantity inc
when maximise profitability
when marginal revenue and marginal cost equal each other
marginal cost curve cuts average total cost curve where
at a minimum point of ATC curve and from below
minimum efficient scale
there’s a quantity which will minimise ?