In sport tournaments, the rules are presumably structured in a way that any team cannot be better off (e.g., to advance to the next round of competition) by losing instead of winning a game. Starting with a real-world example, we demonstrate that the existing national rules of awarding places...

As an old Chinese proverb says, "visiting monks give better sermons." European soccer clubs also believe this, and have always been seeking for foreign players to boost competitiveness. However, due to the reason of protectionism, there were restrictions that each club was only allowed to field...