Consumers are gonna maximize their utility subject to a budget constraint. How do consumers put them together? Graphically, the representation of preferences was our indifference curves. That represented people's indifference with further out indifference curves made people happy So, essentially, what we're gonna ask graphically is what is the highest indifference curve you can achieve given your budget ? We know you want to be that highest indifference curve possible by more is better. So we're simply gonna ask what is the highest indifference curve you can reach given your budget. Utility is square root of P times C, OK? And let's consider the same budget we wrote down up here-- $72 income, $12 price of pizza, $6 price of cookies. And now let's ask where can you go with that. So, in figure 3-4, you have our budget constraint, which runs from 6 pizzas to 12 cookies. That's the original budget constraint. And you have a series ...