Richer people spend an increasing share of their income on services that are either impossible to trade (for example, restaurant meals) or difficult to trade (such as health services). Non-tradable sectors tend to account for a growing share of employment and economic activity.
首先，发达经济体的消费模式发生了变化。富人越来越多的把收入份额花费在服务上，这些服务要么是不可能进行贸易（例如，外出用餐），要么是难以贸易（如卫生服务）。非贸易部门在就业和经济活动中占据的份额越来越大。