9.15. A market contains a group of identical price-taking firms. Each firm has a marginal cost curve SMC(Q) 2Q, where Q is the annual output of each firm. A study reveals that each firm will produce if the price exceeds $20 per unit and will shut down if the price is less than $20 per unit. The market demand curve for the industry is D(P) 240 P/2,where P is the market price. At the equilibrium market price, each firm produces 20 units. What is the equilibrium market price, and how many firms are in this industry?

The hawthorne works was a large western electric factory with 45,000 employees. during the 1920s and 1930s, hawthorne works was the site of some well-known industrial studies. in one of the studies, researchers investigated the impact of different working conditions on worker productivity. prior to the start of the study, researchers secretly measured workers' productivity for several weeks. then researchers chose two workers, who then chose their own teams. the teams were separated from the general workforce and completed their work in different experiment rooms where the researchers could observe them more easily. over a 5-year period researchers manipulated the structure of the workday for each team (number and duration of breaks and number of hours per shift). for each of these changes in working conditions, the researchers measured the effect on productivity. for some conditions, such as frequent short breaks, workers rebelled by intentionally decreasing productivity.why did the researchers secretly measure the workers' productivity before creating the two treatment groups? a, to create similar treatment groups so that a cause-and-effect relationship could be establishedb, to draw conclusions about the productivity of all workers in the plant based on the test groupsc, to directly control for confounding variablesd, to provide a baseline for measuring worker productivity

When the amount for land is 36,000 and the amount paid for expenses is 10,000, the balance of total asset is

Stella company sells only two products, product a and product b. product a product b total selling price $50 $30 variable cost per unit $20 $10 total fixed costs $2,110,000 stella sells two units of product a for each unit it sells of product b. stella faces a tax rate of 40%. stella desires a net afterminustax income of $54,000. the breakeven point in units would be