Other things the same, an increase in wages above their equilibrium level

a. increases frictional unemployment but leaves the natural rate of unemployment unchanged.
b. increases frictional unemployment and increases the natural rate of unemployment.
c. increases structural unemployment but leaves the natural rate of unemployment unchanged.
d. increases structural unemployment and increases the natural rate of unemployment.

Xinhong company is considering replacing one of its manufacturing machines. the machine has a book value of $39,000 and a remaining useful life of 5 years, at which time its salvage value will be zero. it has a current market value of $49,000. variable manufacturing costs are $33,300 per year for this machine. information on two alternative replacement machines follows. alternative a alternative b cost $ 115,000 $ 117,000 variable manufacturing costs per year 22,900 10,100 1. calculate the total change in net income if alternative a and b is adopted. 2. should xinhong keep or replace its manufacturing machine