The chief of a large fund house sits late afternoon every day and dutifully pours over the net asset values (NAVs) of his schemes. After scrutinising the returns for the day, he decides on the expense ratios that need to be charged and deducted for each category.
The executive is not alone. In fact, many fund houses, especially those that handle significant institutional money, dabble in what some call "NAV management", which involves adjusting the expenses based on the returns made on the particular day.