3.1) normal (Normal Goods), quantity purchased typically has normal relations in the same direction with the income levels of consumers. That is, if consumer demand increases revenue per item is usually increased. If the consumer revenue decreased consumed would be reduced.Bad item 3.2), quality (Inferior Goods) certain types of items are bad in the eyes of consumers. Therefore, it would be contrary to the relationship of the income levels of consumers.4) taste of consumers. Consumer tastes will vary, depending on age, educational level, profession, assimilated. Normally, the tastes will change according to the modern era. If an item is out of date, demand will be reduced.5) population in General, the country's population when they added up the demand for goods and services will increase, but the increase of the population must have the power to buy with it is demand.6) prognosis for future events to demand change, such as predictions that rice will have a higher price. The current demand for rice will increase. Conversely, if the predictions that the price will decrease decrease demand annulled.7) season demand quantity in which the item is purchased in each moment is different in the summer season, June demand per fan and air conditioning will be higher.
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