In fact, the main advantage of the economic flow approach is that it requires us to take a comprehensive view of the three forces that everywhere determine the flow of inheritance and its historical evolution. In general, the annual economic flow of inheritances and gifts, expressed as a proportion of national income that we denote by , is equal to the product of three forces: by = μ × m × β, where β is the capital / income ratio (or, more precisely, the ratio of total private wealth, which, unlike public assets, can be passed on by inheritance, to national income), m is the mortality rate,
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