Some is better technology or better looking product. Most nowadays is marketing. When they can’t increase sales from new customers, they have to make their current customers buy more or buy more quickly between new model numbers.
Most manufacturing companies that used to compete on quality (ours is better than theirs so give your money to us) are now working hand in hand with the competitors (called collusion and used to be illegal) and they all agree to shorten the lives of products in order to force more purchases, called *designed obsolescence*. (see [the lightbulb conspiracy](https://www.youtube.com/watch?v=wzJI8gfpu5Y))
Instead of doing something about this issue, as well as dozens of others that touch our daily lives, we are trained to yell at one another about abortion, immigration and other ‘divide & conquer’ strategies from the powers that be.
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