Consider the single crossing condition in the model of household sorting into communities with different levels of public goods. The model assumes that higher income households tend to have steeper indifference curves compared to lower income households.

a)Explain the meaning of the slope of the indifference curve. Be precise.

b)What if -contrary to the model set up from classlower income households' indifference curves were steeper? Which basic idea from Intro to Econ would be violated in this case. Explain.