Final answer:
A permanent reduction in the rate of technological progress in the Solow growth model will lead to a decrease in the long-run growth rate of output per worker and per effective worker, a potentially lower long-run level of output per effective worker, and a lower long-run level of aggregate output.
Step-by-step explanation:
In the context of the Solow growth model, a permanent reduction in the rate of technological progress will have several long-term effects on economic growth. First, the long-run growth rate of output per worker will fall because technological progress is a key driver of increases in output per worker. Second, the long-run growth rate of output per effective worker will also fall, as the quality-adjusted labor input will grow more slowly. Third, this change does not necessarily mean that the long-run level of output per effective worker rises; instead, it may lead to a lower level than if technological progress had not slowed. Fourth, the long-run level of aggregate output will be lower than it would have been under a higher rate of technological progress. Finally, in the short term, or the first decade or so, the growth rate of output per worker will experience a decline until the new lower steady state growth rate is reached.