This paper studies the effect of foreign competition on the extent of forecasting bias. I focus on two biases often described in the behavioral economics literature: overoptimism and excessive belief in trends. Using data from firm-level surveys in five African countries, I show that firms that do not face foreign competition generate forecasts of sales growth that have greater trend and optimism biases than firms that have foreign competitors. I further provide evidence that these erroneous forecasts have real effects on firms' inventory management.

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