In sectino 22 of the rule book, it says that player collect trade cards starting with the player with the least number of cities. The rule book does not clarify the order for players with the same number of cities. I assume AST order, but the rule book may want to clairify that in section 22.

Craig

AST is correct. The original rule book stated that in the case of ties, AST is the tie breaker. I remember that sentence was still in the new one, too.