Question

what is the meaning of low cost and high yield

Answer 1

getting a better gain with less effort

Answer 2

Description of investments with high rates of return. Generally, a high yield bond will be ranked very low by a rating agency, because these are bonds which have a relatively high chance of default, and therefore have to offerhigher returns. Similarly, a stock will offer a high dividend yield in order to compensate for lower expected capital gains, for example a large company in a mature industry which is no longer growing.