Incidental Market Creation
Malcom McLean was an ambitious rising entrepreneur who used macro opportunities to get rich. He made good money transporting fuel. In the first decade of business he had 162 trucks earning $2.2M (a lot in 1945). Another 10 years and he would 3x that business only to later shut it down.
Crowded shipping ruined post-war and roads were crowded. He tested standard shipping containers and immediately cut cost by 94%. To transport a ton now cost 5.83.