Editing Indifference curve (section)

==== Biology ====
As used in [[biology]], the indifference curve is a model for how animals 'decide' whether to perform a particular behavior, based on changes in two variables which can increase in intensity, one along the x-axis and the other along the y-axis.  For example, the x-axis may measure the quantity of food available while the y-axis measures the risk involved in obtaining it.  The indifference curve is drawn to predict the animal's behavior at various levels of risk and food availability.