Abstract
In its purest form a collective good is said to possess the characteristics of non-rivalness in consumption and non-price exclusion. Non-rivalness implies that consumption to the full by one person in no way impedes the consumption of that same quantity by others. This does not mean that the same subjective benefit is derived by each individual, but simply that consumption by one individual does not interfere with the benefits derived by another. The characteristic of non-exclusion requires that if the good is provided to one then it is provided to all. It is this attribute in particular which casts doubt on the likelihood that, in a large group, individuals will voluntarily reveal their preferences for the good. Goods which are not perfectly rival but which are price exclusive may be provided in the market by clubs. However, when an individual's consumption of a good is not dependent on his making a contribution to its provision the individual utility maximizer may be inclined to ‘free ride’, in the hope of enjoying the good at no personal expense. It is clear that if all individuals act in the same manner this good is not likely to be provided in the private market.

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