On Monday, Mick puts an offer in the mail to Sheri to sell his guitar for $50. Monday night when jamming with his buddies, he decides he will really miss his old guitar and has second thoughts about selling it. Tuesday morning he puts a revocation in the mail informing Sheri he has changed his mind and the guitar is no longer for sale. The revocation is effective on Tuesday morning.
True / False.

"in the electricity industry, low average total costs are obtained only through large-scale production. in other words, the initial cost of setting up all the necessary wiring makes it risky and, most likely, unprofitable for competitors to enter the market. throughout much of the 20th century, many people viewed south africa’s de beers group as a monopoly because it controlled a large percentage of diamond production and sales. patents are granted to inventors of a product or process for a certain number of years. the reason for this is to encourage innovation in the economy. without the existence of patents, it is argued, research and development for improved electronics is unlikely to take place, since there’s nothing preventing another firm from stealing the idea, copying the product, and producing it without incurring the devel opment costs."which of the following best explains the barriers to entry that exist in this scenario? increasing returns to scale legal barriers exclusive ownership of a necessary resource