But exceptions exist, the British statisticians Jifen great famine in Ireland had asserted period when potato prices, the poor will increase consumption of potatoes.

 
  • 但存在例外,英國統計學(xué)家吉芬曾斷言在愛(ài)爾蘭大饑荒時(shí)期,當土豆價(jià)格上升時(shí),窮人對土豆的消費會(huì )增加。
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