Physioeconomics Equatorial Paradox there are no (with minor exceptions such as Singapore and Brunei)rich economies lying in the region from one thousand miles north of the equator to one thousand miles south of it. Physioeconomics:the basis for long-run economic growth ▪ there are no (with minor exceptions such as Singapore and Brunei) rich economies lying in the region from one thousand miles north of the equator to one thousand miles south of it