求翻译：并不是所有商品都是正常商品，当收入减少时，低挡商品的需求量会增加，比如，你收入减少时，你不会买车或者打出租车，可能会坐公交车是什么意思？

Not all goods are normal goods, when the reduction in income, the lower block will increase the demand for goods, for example, reduce your income, you will not buy a car or taxi, bus may be

Not all commodities are normal commodity, when income decrease, Low Block of commodities will increase demand reduction, for example, when your income, you will not buy a car or taxi, you may sit the bus

Is not all commodities all is the normal commodity, when income reduction, keeps off the commodity the demand to be able lowly to increase, when for instance, you receive the reduction, you cannot buy the vehicle or split out rent a car, possibly can ride the public transportation

Not all commodities are normal goods, when income is reduced, low retaining commodity demand increases, for example, when a reduction in your income, you will not buy a car or a taxi, may be by bus

Not all commodities are normal goods, when income is reduced, low retaining commodity demand increases, for example, when a reduction in your income, you will not buy a car or a taxi, may be by bus