profit
TR-TC
shareholders
firms try to serve
sole proprietorship
total liability, but you get all the profits
partnership
shared liability and shared profits
corporations
shareholders, dividends paid to shareholders from profits, limited liability to shareholders, based on capital first used to pay for corporation.
stocks
issuing ownership in a company
bonds
issuing debt for a company
normal profits
the best a firm can be doing at that point. economic profit good enough to keep the firm engaged in its current activity
TC
VC+FC
AFC
FC/Q
AVC
VC/Q
ATC
TC/Q
MC
delta TC/ delta Q
Allocative efficient
p=MC, MC=MB
Productively efficient
P= Average Total Cost