The French celebrate that day because it commemorates the Storming of the Bastille on July 14, 1789. It was a turning point of the French Revolution. Also, Fete de Federation was held on July 14,1790. It was a way to celebrate the constitutional monarchy in France.
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It's part of your civil dutie as a citizen and It is the law for people to actively contribute to society.
The most logical combination would be to decrease the production of balls, and increase the production of nets, in order to achieve a market equilibrium that allows both products to be sold. For this it would be necessary to allocate more money to the production of nets, and to diminsh the cost referred to balls, until arriving at half of expense for each one.
Answer: In 1881, in the general american election.