Seen through the introduction of English law into Britain's East African colonies; their economic interests were in the colonies' tea, coffee, and other plantations, and these required a plentiful source of local labour. Though the local economy wasn't a money economy, so to force people to work, British introduced tax payable in cash, and not paying this was punishable criminal offence. Money to pay tax could only be earned through working on plantations, the law then served the economic interests of capitalist plantation owners.