PT - JOURNAL ARTICLE AU - Hector Chan TI - Market Impact Decay and Capacity AID - 10.3905/jpm.2022.1.382 DP - 2022 Jun 30 TA - The Journal of Portfolio Management PG - 127--144 VI - 48 IP - 6 4099 - https://pm-research.com/content/48/6/127.short 4100 - https://pm-research.com/content/48/6/127.full AB - Recent studies have documented that market impact decays slowly through time. The author studies the impact of such slow decay on trading strategies’ capacity. To do so, he proposes a numerical methodology to estimate capacity. A key benefit of such a procedure is its flexibility in incorporating any specification of market impact. In particular, because trades tend to be more autocorrelated when capital devoted to a trading strategy increases, capacity is sensitive to assumptions on market impact decay. The slow decay of market impact leads to trading strategy capacity estimates that are significantly lower than shown in previous capacity studies.