D. Demand, demand means the desire of purchasers, consumers, clients, employers, etc., for a particular commodity, service, or other item.
Supply means the amount of a good or service offered for sale.
Export means a commodity, article, or service sold abroad
And import means a good or service bought in one country or company that was produced in country or company.
In this case the demand is the customers desire for a commodity. Which means the more demand a commodity gets the more people want it.
