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The federal reserve is keeping the federal funds rate low to try and run the economy "hot", and grow inflation. This is in the hopes that a "hot" economy will also grow wages and decrease unemployment further. Inflation is seen as less of a problem in recent years, as its been too low* for a long time. The low federal funds rate (federal reserve interest rate) results in new Treasury bills being issued at very low interest rates. Large banking institutions must maintain certain capital reserves, which they hold in these TBills, and the low interest rates mean the banks earn tiny returns on the capital. Banks, being commercial ventures, are expected to return a certain profit. The low interest rates from the TBills are too low of a rate, and won't cover inflation or operating expenses. So banks must chase riskier investments (in general, risky investments return higher interest rates) with their remaining capital to return high enough profits. The riskiest investments are startups. Very high returns, if a startup succeeds and exits in an IPO, but failure is more common. Banks don't invest in startups though, they are too risky, but banks end up investing in all the less risky assets available. This demand for "medium" risky assets (sovereign debt, corporate or municipal bonds) drives other investors out of the market, they can't compete with the volume banks can purchase at, and are forced to chase the even riskier assets banks won't touch. So low rates -> low interest tbills -> banks chasing risky assets -> investors chasing startups |
http://thehill.com/policy/finance/337790-fed-raises-rates-fo...
and
https://www.nytimes.com/2017/09/20/business/economy/fed-bond...