We explore a new dimension of fund managers' timing ability by examining whether they can time market liquidity through adjusting their portfolios' market exposure as aggregate liquidity conditions change. Using a large sample of hedge funds, we find strong evidence of liquidity timing. A bootstrap analysis suggests that top-ranked liquidity timers cannot be attributed to pure luck. In out-of-sample tests, top liquidity timers outperform bottom timers by 4.0–5.5% annually on a risk-adjusted basis. We also find that it is important to distinguish liquidity timing from liquidity reaction, which primarily relies on public information. Our results are robust to alternative explanations, hedge fund data biases, and the use of alternative timing models, risk factors, and liquidity measures. The findings highlight the importance of understanding and incorporating market liquidity conditions in investment decision making.

The firm‐level bullwhip effect is the amplification of demand uncertainty along a supply chain—that is, fluctuations in production (for manufacturing firms) or purchases from suppliers (for retailers or wholesalers) in a firm tend to be greater than its demand fluctuations. We predict that the bullwhip ratio (a proxy for the bullwhip effect) amplifies the relation between demand uncertainty and cost structure. We expect this amplifying effect because the bullwhip ratio determines the extent to which demand uncertainty translates into uncertainty in production or purchases, which, in turn, affects cost structure. Using data from public US firms over the 1990–2020 period, we find results consistent with our prediction. Specifically, we find that both the negative relation between demand uncertainty and cost elasticity in the manufacturing sector and the positive relation between the two in the retail/wholesale sectors are stronger for firms with higher bullwhip ratios. We contribute to the literature on cost structure by highlighting the important role of the bullwhip effect in cost structure decisions.