Supply-side tax cuts designed to increase investment spending are attractive in theory, but in practice, which of the following results? Question 20 options: a) They are less useful because they take a long time to increase the capital stock. b) They have no effect on the capital stock in the short or long run. c) The effect is the opposite of what theory suggests. d) They are powerful in the short run as capital stock rapidly increases, but the effect tapers off in the long run