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Econ Notes

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Section 4 notes
When we talk of the firm, we talk about 2 very different parts of the firm, and someone in the middle - who is the owner. There is a whole back office operation, and front office operation.
Back office and front office operations have nothing to do with each other. You as a manager take info from both and make decisions.
Back office - making the stuff, factory, plant . / operations start from preference (exogenous from the model) = > utility function In firm we start from technology. => we get the production function Q=f(K;L) - back office operation - we get the cost K = f(q); L = f(q)
Front office - where we are selling the stuff. = > We start from Demand, which is exogenous to the model. Q = f(P). In the end we get - Total Revenues.
Owner is going to decide how much to produce to maximize profits.
Isoquant (IQ) = equal quntity along the line.
Here the constraint is C = wL + rK - ISO Cost line C = w(f1Q) + r(f2Q)
MRTS = -MPL/MPK = w/r
Demand function - Q = f(P) / Revenue = P(Q)
Marginal Revenue = dR/dQ π = Total Revenue - Total Cost dp/dq = dr/dq - dc/dq (FOC)
@ P MAXIMIZING MR - MC = 0 (MR = MC)

Back office is the factory plant, making the goods. Their operations start from technology and in the end get the production function Q=f(K;L) and then the marginal cost.
Front office is selling whatever is made in the back office. We start from Demand, which is exogenous to the model Q = f(P). In the end we get Total Revenues and figure marginal revenues. 2) The owner blends the info coming both from back and front offices, to make a decision seeking to maximize profits. Its when the marginal cost equals marginal revenue.

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