Change in the population of consumers:Population changes may affect the demand for a commodity.Areas of high population may demand more of certain commodities than areas of low populations. For example, Nigeria may demand more of certain goods and services than Ghana because Nigeria’s population is higher than that of Ghana. And even as the population of a country increases the demand for goods and services may also change.Changes in market strategiesMarketing strategies such as advertising, publicity and sales promotions (e.g. raffles are means used to get consumers to increase their purchases of a commodity. They are intended to inform and persuade existing consumers as well as new ones to buy more of the commodity. Effective marketing strategy will lead to an increase in demand for the commodity, all other things being equal.