External publications

Unravelling the effects of Indonesia's oil palm export ban on global stock markets

Ölkers, Tim / Charlotte-Elena Reich / Anna Roeland / Olliver Mußhoff
External Publications (2026)

in: Agriculture and Resource Economics, first published 03.09.2026

DOI: https://doi.org/10.1111/1467-8489.70151
Open access

Export bans are frequently used as trade policy instruments to stabilise domestic prices, but they often generate unintended consequences. This study examines the effects of Indonesia's palm oil export ban, introduced in April 2022 and lifted in May 2022, on the performance of the global agricultural sector and the stock markets of palm oil–producing countries. Drawing on a conceptual framework, we develop hypotheses regarding how stock indices with different industrial compositions respond to such trade policy interventions. Using an event study methodology, we analyse daily stock market data from palm oil–producing countries as well as a global agriculture-specific MSCI index. The analysis encompasses both nationally diversified stock indices and a global sector–specific index. The results reveal statistically significant negative cumulative abnormal returns for the global agricultural index following the introduction of the export ban, whereas national cross-industry indices show statistically insignificant reactions. Following the lifting of the ban, the global agricultural index experienced statistically significant positive cumulative abnormal returns, whereas national indices exhibited mixed and statistically insignificant responses. These findings are consistent with the conceptual framework, suggesting that the policy primarily affected the global agricultural sector while leaving diversified national stock markets largely unaffected. Importantly, the effects associated with the introduction and subsequent lifting of the ban did not fully offset each other, resulting in an overall negative net effect on the global agricultural index.

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