Imperfect Competition - many sellers and few buyers
Public vs. Private goods - products or good that all can access. Non-exudable, non-rival (benefits shared by large group)
Externalities - when production or consumption of one party affects production or utility of another party.
Income Inequality - S & D for ag products is very inelastic. Supply increases rapidly; demand doesn't. Supply is a function of lagged price
Economic instability - the farm problem. Farmers may have lower incomes, but are wealthier in terms of physical assets
Market inefficiencies - want to reach equilibrium to be efficient. Government needs to step in when market is not working | 
