Inter-related Demand:
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1.Joint demand: When several things are demanded for a joint purpose, it is a case of joint demand. Milk, sugar and tea leaves are wanted for making a tea.

2.Composite demand: The demand for a commodity that can be put to several uses is a composite demand. Coal can be used for heating, cooking and for a running steam engine etc. Similarly milk can be used for making different dairy products like penda, cheese, curd, etc.

3.Latent Demand: It is probably best described as the potential demand for a product. It exists when there is willingness to buy among people for a good or service, but where consumers lack the purchasing power to be able to afford the product. Latent demand is affected by advertising.

4.Speculative Demand: The demand which is not for consumption purpose but for profit making is called speculative demand.