Some time later, Exetron Corp. produced an automobile wheel balancer that used a hard-bearing device similar to the Doneys’ device. Given that the Doneys had not used their device for automobile wheel balancing, does Exetron’s use of a similar device infringe on the Doneys’ patent? (See Patents.)

Suppose an economy has only two sectors: goods and services. each year, goods sells 80% of its outputs to services and keeps the rest, while services sells 62% of its output to goods and retains the rest. find equilibrium prices for the annual outputs of the goods and services sectors that make each sector's income match its expenditures.