Research on 'happiness' suggests that once an average per capital income of around US$10,000 is achieved in a country, further increases in income will not lead to a significant increase in happiness. Additional income will probably often be spent on the satisfaction of mainly 'relative' needs,...

Research on 'happiness' suggests that once an average per capitaincome of around US$10,000 is achieved in acountry, further increases in income will not lead to a significantincrease in happiness. Additional income willprobably often be spent on the satisfaction of mainly 'relative'needs, of...