Opium and Empires

On the basis of a new database of stock and commodity prices, Stock returns for a few Malayan industries related to international trade are significantly correlated with opium price changes, as are prices for labour-intensive, Chinese-dominated export commodities such as tin and gambier. However, opium price changes explain, at most, only a small fraction of the behaviour of stock and commodity prices. On balance, stock and commodity markets ascribed only secondary importance to ups and downs in the opium trade as measured by the price of the drug.