tiff to prove that "he is within that sector of the economy which is endangered by a breakdown of competitive conditions in a particular industry." Jeffrey v. Southwestern Bell, 518 F.2d 1129, 1131 (5th Cir.1975). See Construction Aggregate Transport, Inc. v. Florida Rock Industries, Inc., 710 F.2d 752, 762 (11th Cir.1983)