For each of the following shifts(a, b,c,& d) in the demand curve and associated price change of a complement or substitute item, explain whether the change in the price of the complement or substitute must have been an increase or a decrease.

a. a rise in the demand for a dashboard global-positioning-system device follows a change in the price of automobiles, which are complements.
b. a fall in the demand for e-book readers follows a change in the price of e-books, which are complements.
c. a rise in the demand for tablet devices follows a change in the price of ultrathin laptop computers, which are substitutes.
d. a fall in the demand for physical books follows a change in the price of e-books, which are substitutes.

The struter partnership has total partners’ equity of $510,000, which is made up of main, capital, $400,000, and frist, capital, $110,000. the partners share net income and loss in a ratio of 80% to main and 20% to frist. on november 1, adison is admitted to the partnership and given a 15% interest in equity and a 15% share in any income and loss. prepare journal entries to record the admission of adison for a 15% interest in the equity and a 15% share in any income and loss under the following independent assumptions. (1) record the admission of adison with an investment of $90,000 for a 15% interest in the equity and a 15% share in any income and loss. (2) record the admission of adison with an investment of $120,000 for a 15% interest in the equity and a 15% share in any income and loss. (3) record the admission of adison with an investment of $80,000 for a 15% interest in the equity and a 15% share in any income and loss.

The questions of economics address which of the following ? check all that apply

When cell phones were first entering the market, they were relatively large and reception was undependable. all cell phones were essentially the same. but as the technology developed, many competitors entered, introducing features unique to their phones. today, cell phones are only a small fraction of the size and weight of their predecessors. consumers can buy cell phones with color screens, cameras, internet access, daily planners, or voice activation (and any combination of these features). the history of the cell phone demonstrates what marketing trend?