By Rene TorresSpecial to the AdvanceTo understand why major league teams made their way to cities like Brownsville during the off season, one must look at the economics of baseball.Early in major league history, few teams were making a profit and those that were, it was just enough to pay for expenses. It was not uncommon for teams to face yearly financial crises.The biggest cost for owners was player salaries and the competition among teams for players, which drove that expense even higher.One way the owners decided to reduce competition and keep salaries low was to introduce the reserve clause ...