Bureau of ARricultural Economics SCALE b

B. Comparison of the Indexes of Production, Total Value, and Price of Seventeen Vegetables for Fresh Market in the United States from 1919 to 1936.

In curve charts, when a number of curves are plotted on the same grid and when a number of curve patterns are used, it is better to have the curves labelled as they are here than to have a boxed legend or key to identify them.

INDEX NUMBERS SHOWN BY CURVES

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U S Drpnttmfiit of Commerce. Division of Economic Rrscarch, "Survey of Current Busi nr%5 June l'»38 SCALE <>

A. Indexes of Income Paid Out by Type of Paynnent in the United States from 1929 to 1937. 1929 Equals 100%.

1. Till' thfcjry of index numbers is clearly

demonstrated in this chart. Since the hgurcs for 1929 are equal to 100%, every curve begins at the same point in 1929.

2. In choosing a base year, care should

be taken to select one which is representative, and devoid of "high peaks" or "low valleys."

3. For another method of presenting this

material, sec 114A.

Per Cent

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Leonard P Ayrcs

B. Method Developed in Washington, D. C, During the World War to Keep Track of British Ship-Building.

The blue lines going up show the new tonnage built in each three months' period. The