opprotunity cost		alternative or choice
trade off		cost of the next best choice
fixed cost		money recieved for goods or services sold
variable costs		dont trip
marginal cost		costs which dont change
total cost		change
revenue		costs which change
marginal revenue		fixed plus variable cost
cost benefit analysis		giving up one thing for another
bear down		revenue in addition to cost
vary		increase in expense caused by producing another unit of something
option		compares benefit size by dividing cost by two