Lipoti la Harvard Business Comment: Pafupifupi maola 4 miliyoni patsiku ku UK amagwiritsidwa ntchito pamisonkhano yamagulu, ku United States, pafupifupi misonkhano yamagulu 1,100 patsiku, iliyonse yomwe ili maola 3.5 patsiku, osati ola limodzi.