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Are there any other interesting aspects about the Irving Fisher article?
Irving Fisher is probably best remembered today in neoclassical economics for his theory of capital, investment, and interest rates.
What was Irving Fisher's quote on interest rates?
The relative price of goods available at a future date, in terms of goods sacrificed now, is measured by the interest rate.
What was Irving Fisher's quote on capital?
A good available now has a different value than the same good available at a later date; value has a time as well as a quantity dimension.

Question: did he get any help with his books
Self-contained rewrite: did Irving Fisher get any help with his books?