In this article I show that a permanent possitive shock on the rate of
investment-specific technical progress might cause, at least in the short
run, a fall of the growth rate of both output per capita and total factor
productivity, as measured by the Solow residual. Several simulations are
performed which show that the extent of the Productivity Slowdown
drastically depends on the elasticity of the marginal cost of producing a
unit of capital good with respect to the rate of investment-specific
technical progress.