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At what interest rate should debt be used as a tool?
I don't really see it as worth it at any level because of the risk. If you take $10,000,000 using the ratios you gave making 2% return. That is a profit of $200,000. Definitely not worth it, but lets go to 20% profit that is $2,000,000. To me the risk involved at beint 10 million in debt isn't worth it to make $2,000,000 quickly it would be pretty easy doing something wrong to wipe out everything.