 The Columbus / Dayton corridor is considered one of two " <unk> " in America 's logistics sector . This is evident in the Dayton region , in part , with the expansion of a 1 @,@ 000 @,@ 000 @-@ square @-@ foot ( 93 @,@ 000 m2 ) distribution center by Caterpillar Inc. and a major Payless ShoeSource distribution center . Transportation and warehousing employs 183 @,@ 000 Ohioans , amounting to a $ 12 billion industry , or 3 @.@ 6 % of the GSP . Since 2003 , Ohio has added 21 @,@ 500 logistics jobs . 
