So this right over here is in thousands of dollars. Thousands of dollars. So if x is one, that means 1,000 pairs produced. 10 times one says r is equal to 10, but that really means $10,000. Now, it would be a nice business if all you had was revenue and no costs, but you do have costs. You have materials, you have to build your factory, you have to pay your employees, you have to pay the electricity bill. And so you hire a bunch of consultants to come up with what your cost is as a function of x.