A boom in the production and export of cotton made Iran the richest region of the Islamic caliphate in the ninth and tenth centuries. Yet in the eleventh century, Iran's impressive agricultural economy entered a steep decline, bringing the country's primacy to an end.

Richard W. Bulliet advances several provocative theses to explain these hitherto unrecognized historical events. According to Bulliet, the boom in cotton production directly paralleled the spread of Islam, and Iran's agricultural decline stemmed from a significant cooling of the climate that lasted for over a century. The...

A boom in the production and export of cotton made Iran the richest region of the Islamic caliphate in the ninth and tenth centuries. Yet in the eleventh century, Iran's impressive agricultural economy entered a steep decline, bringing the country's primacy to an end.

Richard W. Bulliet advances several provocative theses to explain these hitherto unrecognized historical events. According to Bulliet, the boom in cotton production directly paralleled the spread of Islam, and Iran's agricultural decline stemmed from a significant cooling of the climate that lasted for over a century. The...