The impact of computers on productivity in the trade sector: Explorations with Dutch microdata

The impact of computers on productivity in the Dutch trade sector during the period 1988-1994 is examined. The analysis is based on a panel data set derived from the Production Survey of Statistics Netherlands, which includes data on output, employment, wages, and various types of investment. A new method is developed to estimate IT- and non-IT capital stocks for each firm based on investment flows and booked depreciation figures by firm. A Cobb-Douglas production function setting is used to study the effect of computer capital stock on productivity. We find that computers contributed positively to productivity, even when firm-specific effects such as labour quality are accounted for. In retail trade computers yielded returns above their relatively high rental price. For wholesaling, no evidence for excessive returns is found. The rates of return were not subject to a decline in the period studied, in contrast to findings for the US. This suggests that the Netherlands has been lagging in the application of IT compared to the US and that further productivity boosting effects can be expected.