A market has four individuals, each considering buying a grill. Assume that grills come in only one size and model. Martina considers herself a grill-master, and finds a grill a necessity, so she is willing to pay $400 for a grill. Javier is a meat-lover, honing his grilling skills, and is willing to pay $350 for a grill. Kamal wants to impress his friends with his vegetable grilling skills and is willing to pay $320 for a grill. Lina loves grilled shrimp and thinks it might be cheaper in the long run if she grills her own shrimp instead of eating out at a restaurant, so she is willing to pay $200 for a grill. If the market price of grills is $300, who will participate in the market?