**Perfect Substitutes Examples**

*A consumer has the option for two different bundles of food and shelter:*

*F = 1; S = 1*

*F = 2; S = 2*

*For each of these options, find the formula for the indifference curve and the marginal rate of substitution with the following utility function:*

$U=F+S$

*How do your answers change if you instead have the following utility function:*

$U=50F+50S$

*Try to solve this yourself, then watch the videos for a walkthrough of how to do it.*

**Cobb Douglas Example**

*Find the indifference curve for utility *$U=\bar{U}$* and the the marginal rate of substitution for the following utility function:*

$U=FS$

*Try to solve this yourself, then watch the videos for a walkthrough of how to do it.*

*Did you feel like any of the videos above were confusing, or could use more detail? If you're a student at Iowa State University, send me a quick note at mclancy@iastate.edu, referencing the video number and your issue, if applicable.*