00:01
So here we have like a classic optimization problem.
00:02
We have a cobb -douglas production function because why not? we also need to produce q equals 200.
00:12
We know that the wage rate, i believe, is 10 and the price of capital is 40.
00:18
So i'm going to call that the wage and the price of capital.
00:22
And we want to minimize cost, right? so we want to minimize cost, which is equal to the w times l plus the r times k.
00:33
We just have to do this subject to the constraint of 100 equals 10 l to the, sorry, l to the 0 .5 k to the 0 .5 or 10 is equal l to the 0 .5 k to the 0 .5.
00:48
Now, the easiest way to do this is to rearrange.
00:52
Now, right, i can get k to the 0 .5 is equal to l, sorry, equals to 10 over l to the 0 .5 or k is equal to 100 over l, right? that's just rearranging my constraint.
01:10
Then i can rewrite my cost function as wl plus r outside of 100 over l.
01:21
Now i can take a first order condition, right? i can differentiate with respect to l and i've reduced it to a function of one variable.
01:28
So i get w plus r to the, and i'm going to treat this as l to the minus one to the minus one l to the minus two.
01:40
We set that equal to zero...