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A. The Price of Tin Per Pound in the United States from 1 93 I to 1 938.

1. The inverse relationship chart is an especially interesting one. If there is a causal

relationship, a rise in one curve may cause a fall in the other.

2. The causal relationship between supply and demand and its effect upon price is well

known and is presented in this chart. As the "world's visible supply" of tin goes down, the price per pound goes up, but not necessarily at the same rate.

3. One of the most common forms of inverse relationship is that as production increases,

unit costs usually decrease.

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B. Twenty-five Year Comparison of Dun's Insolvency Index and the Cleveland Trust Company Index of Business in the United States.

1. Compare with A above.

2. Obviously the records of insolvency show an increase during periods of lessened business