Jill is planning the timing of her on$-$the$-$job training investments over the life

cycle.

a$.$ What happens to Jill$$s OJT investments if the market$-$determined rental rate to

an efficiency unit falls?

b$.$ Jill$$s discount rate increases?

c$.$ the government passes legislation delaying the retirement age until age $70.$

d$.$ technological progress is such that much of the OJT acquired at any given age

becomes obsolete within the next $10$ years