options 1.lower or higher

2.do not have or have

3.are not or are

4.more or fewer

6.engage in a lot of or do not engage in much

7.may not or often

Why has their popularity increased? andex funds have become very popular because of their performance relative to other mutual funds. Index funds incur lower fees because they do not have xpenses for research. Because they are frequently revised, the fund's portfolio has transaction costs than actively managed portfolios. In addition, because they trading, index funds generate capital gains