That 'the invisible hand' (by which I assume you mean the free market) prevents reuse is simply not true. In a competitive free market you would have companies that would specialise in reuse. For Apple's products that is exactly what happens: there are actually quite a few companies selling refurbished second hand Apple products (e.g. [1] and [2]), including Apple itself [3]. Of course, regulation sometimes gets in the way: India's prime minister Modi is preventing Apple from selling second hand iPhones in India in an attempt to get them to start producing products in India.
The free market has many short-comings. Preventing reuse is not one of them.
[2] https://www.forza-refurbished.be/?gclid=CNb63IaEutMCFSEG0wod...
[3] https://www.apple.com/shop/browse/home/specialdeals/mac
[4] http://economictimes.indiatimes.com/tech/hardware/tim-cook-k...
Free market doesn't prevent dumping of hazardous waste in developing countries.
I agree that the free market doesn't prevent dumping of hazardous waste in developing countries.
Companies make money by selling stuff. If every item you needed would be built to last and people wouldn't throw away perfectly good things because the design doesn't match the designs they see on TV anymore, many companies would go belly up.
So...
Low durability = low price = many sold High durability = high price = fewer sold
But mathematically you could still make the same under either approach.
Imagine you could produce a car that never needed repairs and would last a million miles and cost the same to build as current cars. You'd free up tons of mechanics and auto-workers to build and repair other things. Actual economic output would go up, more and better things would be made.