This graph shows an intertemporal budget constraint. On the X axis, we have C0 which refers to consumption today. This is how much of your total income you spend in today's period. On the y axis, we have C1 which is refers to your consumption tomorrow. This is how much your total income you spend in tomorrow's period. What point on the graph below represents a person consuming all of his income in period 0 and saving nothing for period 1