According to the Investment Company Institute's latest tally, in February, there are 634 ETFs that trade on U.S. exchanges, up from 432 a year ago.

FORBES: ETFs For Turbulent Times

Commodity futures trade on what parties assume the year-end tally for certain crops will be.

FORBES: Sky High Tips For Crop Traders

Revenue at stores open at least a year an industry measure of a store's health because it excludes results from stores recently opened and closed rose 4.7 percent in April compared with the same month a year ago, according to a preliminary tally of 12 retailers by the International Council of Shopping Centers trade group.

NPR: Retailers Report Modest Gains For April