<textbookOn>Multiple producers that cannot achieve differentiation are in a commodity business and therefore compete on price. They will try to differentiate; but, if (in this case) the class enforces materials and measurements the products are all the same. If the products are the same, producers will try to differentiate on brand. And it often works to garner a higher price. Laser Performance may be the only producer of Sunfish. But that doesn't make them a monopoly on sailing choices among similar boats. They have to compete against other boats for sales and the re-sale market. But, once a sailor buys a Sunfish to race, new or used, he is faced with a "legal" monopoly in sail choices for racing. There's only one. Prices are set in non-monopolistic markets by supply and demand--not by costs. Costs simply determine if there is enough profit to produce the product or pass on it. Costs have very little to do with pricing. (Seems counter-intuitive, I know.) A monopolist is a price maker; there is no supply curve. The monopolist sets the price to achieve the units he wants to sell and avoid attracting new entrants. Thus, a monopolist supplying a part of a product can determine the entire number of customers for the whole product by his pricing mechanism. In our case, the price of racing sails has a huge impact on the number of racers. We see many, many sailing classes lamenting the demise of their numbers. There are reasons.</textbookOff> Ok. Back to happy thoughts about the pure enjoyment of sailing a Sunfish! I had a great afternoon: About 8 kts on the lake, just a small whitecap here and there, and really had a blast! My tacking is still terrible. But there was enough wind to really get a sense of the differences between port and starboard tacks. Downwind was a good time, too!