Body Sync Inc. is a chain of gyms. It offers a fitness package that allows its members to use the gym facilities for 12 months by paying only for 10 months. Included in the package are two health checkups and a gym kit. These add-ons by themselves are not very valuable, but as a package they can enhance the perceived value of the service offerings. In this case, Body Sync's primary value driver is:.
A. learning-curve effects.
B. availability of complements.
C. experience-curve effects.
D. economies of scale.

Suppose life expectancy in years (l) is a function of two inputs, health expenditures (h) and nutrition expenditures (n) in hundreds of dollars per year. the production function is upper l equals ch superscript 0.40 baseline upper n superscript 0.60l=ch0.40n0.60. beginning with c = 1, a health input of $400400 per year (hequals=44) and a nutrition input of $400400 per year (nequals=44), show that the marginal product of health expenditures and the marginal product of nutrition expenditures are both decreasing. the marginal product of health expenditures when h goes from 44 to 55 is nothing, and the marginal product of health when h goes from 66 to 77 is nothing. (round your answers to three decimal places.)