MLPs can produce prodigious passive income streams.Higher interest rates have been a passive income investor's dream scenario. Even lower-risk fixed-income investments like government bonds and bank CDs offer high yields these days. Because of that, equity investments, which are riskier by nature, have to offer even higher yields to entice income-seeking investors. For example, several high-quality yield-focused master limited partnerships (MLPs) currently pay around 8%. Because of that, a $1,000 investment ...