ECON1101 Lecture Notes - Lecture 17: Microcystin-Lr, Sunk Costs, Opportunity Cost

27 views2 pages
30 May 2018
School
Department
Course
Professor
ECON1101 Week 6 Lecture B
Total Economic Cost: Sum of opportunity cost of all inputs including implicit costs
E.g. Consider a wine maker - Vineyard owner/manager Gina
Revenue = $1 mill
Total Accounting costs: $800,000
Accounting profits: $200,000
Opportunity cost of owner’s time (an implicit cost) is ignored in above accounting
costs
Perfectly competitive markets => price takers firms
E.g. Gold Market copy diagram
E.g. Gold miner in WA copy diagram can sell as little or as much for the market
price (perfectly elastic demand)
Price-taking firms: P = MR = Average Revenues = total rev/quantity = (PXQ)/Q =
P <- using this for profits
Thinking on the margin:
In short run, firm maximizes profits and produces at Q* where P (=MR) = MC
Copy graph firm in short run
Profits = Revenues - total costs (Note: ATC = Total costs/Quantity = TC/Q) =
(PXQ) - (ATCXQ) = (P-ATC) X Q -> positive profits if P (=AR) > ATC (@Q*)
If P(=AR) = ATC (@Q*) then 0 profits
Break-even point: When price = minimum of average total costs (@zero profits)
If P(=AR) < ATC (@Q*) then negative profits
We observe firms producing/operating even when occurring losses why?
Profits = revenues - total costs = revenues - variable costs - fixed costs =
(PXQ) - (AVCXQ) - FC = (P-AVC)XQ - FC.
Note: FC are sunk costs in SR
If Q = 0, then (negative) profits - -FC result.
Can firm do better than profits = -FC?
Yes, if P > AVC, then firm can more than cover its variable costs and
achieve less negative or possibly positive profits. Can offset the losses
rather than doing nothing
But, if P < or equal to minimum of AVC, then the firm should shut down to
maximise profit.
Below AVC is negative loss @ MC = shut down point, Between AVC and
ATC is break even and above ATC is profit
Long run: All inputs are variable including capital K
Insert small firm graph in red and Large firm is blue where K2 > K1 (more capital)
Tend to observe firms which produce more also use more K. Why?
At low Q1, ATC (K1) < ATC (K2) use less capital
At high Q2, ATC (K2) < ATC(K1) use more capital K2
How much they want to produce impacts capital?
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Document Summary

Total economic cost: sum of opportunity cost of all inputs including implicit costs. Consider a wine maker - vineyard owner/manager gina. Opportunity cost of owner"s time (an implicit cost) is ignored in above accounting costs. Perfectly competitive markets => price takers firms. Gold miner in wa copy diagram can sell as little or as much for the market price (perfectly elastic demand) Price-taking firms: p = mr = average revenues = total rev/quantity = (pxq)/q = In short run, firm maximizes profits and produces at q* where p (=mr) = mc. Profits = revenues - total costs (note: atc = total costs/quantity = tc/q) = (pxq) - (atcxq) = (p-atc) x q -> positive profits if p (=ar) > atc (@q*) If p(=ar) = atc (@q*) then 0 profits. Break-even point: when price = minimum of average total costs (@zero profits) If p(=ar) < atc (@q*) then negative profits.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

Related Questions