In economist Robin Hanson's 2001 paper Economic Growth Given Machine Intelligence, he writes
A simple exogenous growth model gives conservative estimates of the economic implications of machine intelligence. [...] Without machine intelligence, world product grows at a familiar rate of 4.3% per year, doubling every 16 years, with about 40% of technological progress coming from ordinary computers. With machine intelligence, the (instantaneous) annual growth rate would be 45%, ten times higher, making world product double every 18 months! If the product shares are raised by 20%, and general technology growth is lowered to preserve the 4.4% figure, the new doubling time falls to less than 6 months.