Dr. frank is a 65-year-old college professor who is contemplating retirement. his health is deteriorating, but he wants to remain mentally stimulated and use the skills he has developed. if dr. frank adopts baltes's selective optimization with compensation model, he should:

1  2  3  4  5  6  7  8  9  10time remaining59: 30in  the dark game, how does the author develop the central idea that elizabeth van lew was a spymaster during the civil war? 1 2 3 4 5 6 7 8 9 10time remaining59: 30in the dark game, how does the author develop the central idea that elizabeth van lew was a spymaster during the civil war?

Three years ago, the city of recker committed to build a park and music venue by the river. it was expected to cost $2.5 million and be paid for from an additional meals tax in the community. the residents pushed back. local restaurants suffered as people ate out less or patronized restaurants in neighboring communities. the project has stalled, but the town council kept pushing it on. this spring, a flood devastated the venue. the town council appears to have suffered from bias

"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