Products of this kind have a slow and imperceptible beneficial effect upon the elderly, but their cost and nuisance value are immediate and obvious, so the elderly have no trouble deciding what to do.
這類產品對老人健康的幫助緩慢而無形，但消費金額與處理上的麻煩卻立即又明顯，老人們的決定下得並不困難。