Risk is an important concept affecting security prices and rate of return risk is the chance that some unfavorable event will occur and there is a trade$-$off between risk and return the higher any investment risk at the blank the return required to induce investors to purchase the assets, this relationship between risk and return in the case that investors are risk, blank, investors, dislike risk and require blank rate of returns as an endorsement to buy risk securities a blank represents the additional concept investors require for being risk