For the longest time, companies offered the employees who stayed with the company for many years a

Question:

For the longest time, companies offered the employees who stayed with the company for many years a defined pension plan for to help them retire when it was time. That time has since passed and companies now offer a defined contribution plan instead.

Why do you think that they have made this change? Do you think that this is an ethical behavior for the companies of today? Why or why not?