Products are considered to be homogenous when they are perfect substitutes and buyers perceive no actual or real differences between the products offered by different firms.

当产品之间是完全替代的，且买者认为不同企业之间所提供的产品没有实际或者真实的差别时，产品被认为是同质的。

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So as far as the consumers are concerned, these two products are perfect substitutes.

对于消费者而言,这两种商品是完全替代品

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If the fuels were perfect substitutes, oil prices would thus tend to be about 6 times natural gas prices.

FORBES: Oil And Natural Gas Prices Get Divorced

Investors do not regard assets in different currencies as perfect substitutes, nor do exchange rates always reflect inflation differentials.

ECONOMIST: Capital goes global

Although the euro will eliminate intra-European exchange-rate risk, it does not mean that German and Italian bonds become perfect substitutes.

ECONOMIST: The international euro | The