India’s income per head, for example, was about $3, 200 in 2009 (holding purchasing power constant across time and between countries).
例如，印度的人均收入在2009年大约是3200美元（不管是跟以往相比还是各国家之间，购买力都没变。）
Nevertheless, the value of money is not constant over time. The purchASing power of money changes AS a result of either inflation or deflation.
但货币的价值并不总是稳定不变的，货币的购买力会随着通货膨胀或通货紧缩而产生变化。
However, money serves its function as a standard of deferred payment only if its purchasing power remains fairly constant over time.
可是，只有在金钱的购买力在一段时间内保持相对稳定的条件下，金钱才能起到赊账延期支付标准的作用。
However, money serves its function as a standard of deferred payment only if its purchasing power remains fairly constant over time.
可是，只有在金钱的购买力在一段时间内保持相对稳定的条件下，金钱才能起到赊账延期支付标准的作用。
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