Now let's see. Do I have enough room for rhubarb? I think I do. how much do I need to make a good pie? [NOISE] [MUSIC] Welcome to the lesson today. As you can see, we are filming from the Farmers' Market in Champaign-Urbana. And, the reason for that is because we're going to talk about tomatoes this week, and we wanted you to see how farmers and consumers find each other to sell their goods. So we'll talk to some of the farmers. We'll talk to some of the directors of farmers markets. We'll hear from them what are the things they do. But one of the reasons we started here in the farmers market is, because the main, main question we want to answer is as an application is why vegetables, in particular, tomatoes cost more at the farmers market than when you buy them at the grocery store? So, as you progress through the lectures this week just try to remember that question, because that is a question we're going to try to answer at the end. So this week we're going to introduce again the model of supply and demand. We're going to, we're going to divide it in four parts. First we do two curves separately, demand supply or supply demand, then we talk about the equilibrium, and then we actually use the, the model to analyze changes. This is a market in action, so we wanted you to see it in the real world. [MUSIC] Produced by OCE-Atlas Digital Media at the University of Illinois, Urbana-Champaign.