Javier carries on a business of selling shoes at a store in a shopping mall. Cecilia also operates a shoe store in the same mall. While they are competitors, they are also friends. They decide that they could both make more money if they did not compete with each other aggressively. In the past, whenever one of them had a sale, usually the other would immediately put their shoes on sale, often with better discounts from the regular retail prices. They agreed that they would not have sales that offered more than 10 percent off the regular retail price. They think that they would each sell just as many shoes but earn more income with this arrangement. Is the agreement between Javier and Cecelia illegal? What is likely to be the effect on competition?