Suppose that the (inverse) demand equation for organic tea is P = 230 - 4Qd and the (inverse) supply curve for organic tea is P = 0.6Qs in a local market. Quantities are
measured in pounds per week, and price is measured in dollars per pound of tea. Find the
equilibrium quantity and price in this market.
Suppose recent regulations for organic tea production, established by the Food and Drug
Administration, increase the costs for producers of organic tea. Under these regulations,
the new (inverse) supply curve for tea is as follows: P = 16 + 0.6Qs. Find the new market
equilibrium quantity and price under these conditions. (Assume that the demand equation
remains the same.) Compare the original equilibrium quantity and price to the new
equilibrium quantity and price. Has price fallen or risen? Has quantity exchanged fallen
or risen?
Sketch a supply-and-demand graph to illustrate the market before and after the regulation
goes into effect (graph paper is not required for this sketch). In this example, has supply
increased or decreased? Are the directions of change in price and quantity that you found
from your computations consistent with this supply increase or decrease?

Suppose that xtel currently is selling at $40 per share. you buy 500 shares using $15,000 of your own money, borrowing the remainder of the purchase price from your broker. the rate on the margin loan is 8%. a. what is the percentage increase in the net worth of your brokerage account if the price of xtel immediately changes to (a) $44; (b) $40; (c) $36? (leave no cells blank - be certain to enter "0" wherever required. negative values should be indicated by a minus sign. round your answers to 2 decimal places.) b. if the maintenance margin is 25%, how low can xtel’s price fall before you get a margin call? (round your answer to 2 decimal places.) c. how would your answer to requirement 2 would change if you had financed the initial purchase with only $10,000 of your own money? (round your answer to 2 decimal places.) d. what is the rate of return on your margined position (assuming again that you invest $15,000 of your own money) if xtel is selling after one year at (a) $44; (b) $40; (c) $36? (negative values should be indicated by a minus sign. round your answers to 2 decimal places.) e. continue to assume that a year has passed. how low can xtel’s price fall before you get a margin call? (round your answer to 2 decimal places.)

True or flase? a. new technological developments can us adapt to depleting sources of natural resources. b. research and development funds from the government to private industry never pay off for the country as a whole; they only increase the profits of rich corporations. c. in order for fledgling industries in poor nations to thrive, they must receive protection from foreign trade. d. countries with few natural resources will always be poor. e. as long as real gdp (gross domestic product) grows at a slower rate than the population, per capita real gdp increases.

Digitalhealth electronics inc. is a company that builds diagnostic devices. it was the first company to develop a compact mri scanner by reconfiguring the components of the mri technology. this smaller and user-friendly version of the huge mri scanner created demand from small hospitals, nursing homes, and private practice doctors who were earlier dependent on the scanning machines in large hospitals. which of the following types of innovations does this scenario best illustrate? a. disruptive innovation b. incremental innovation c. radical innovation d. architectural innovation