Wal- Mart , Kohl 's Corp. , Family Dollar Stores Inc . , and Big Lots Inc. posted May sales that fell below Wall Street 's modest expectations .
Wal-Mart , Kohl 's Corp. and Big Lots Inc. were among the merchants posting May sales below Wall Street 's modest expectations .
a field of study which studies how to create computers and computer software that are capable of seemingly intuitive human behavior.