Engel’s laws

Dr. Engel himself examined the expenditures of thousands of Prussian families and formulated the following four propositions:  “First, That the greater the income, the smaller the relative percentage of outlay for subsistence.  Second.  That the percentage of outlay for clothing is approximately the same, whatever the income.  Third.  That the percentage of outlay for  lodging, or rent, and for fuel and light, is invariably the same, whatever the income.  Fourth.  That as the income increases in amount, the percentage of outlay for sundries becomes greater.”

Few subjects of economic research appear to offer greater rewards to the student than does this one

Economic Crises by Edward D. Jones Ph.D ,Macmillan, London 1900

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