Explain planned obsolescence

It is a design strategy that boost consumption that also resulted in major environmental and human disasters -invented in 1920's to face great depression after stock market crash -psychical obsolescence: when products reach their end life they are no longer functional or repairable -psychological obsolescence: its the mechanism of changing a products style as a way to manipulate consumers into repetitive buying -promotes the idea that new is better -technological obsolescence: due to technological innovations