Not everything in a country can run by a government so which itself enough why we need private sectors to keep things in balance, of course government bend their rules in favour of them for whatever reasons while private sectors create job opportunities that again help someone to make money and they will spend the money they earned so that will obviously help in the development of economy in a country.
If the state allows fair competition, the private sector's contribution to the economy will be positive. The state cannot give jobs to everyone and cannot establish areas where everyone can do business. That's why the private sector is needed. The private sector can create employment in areas that the state does not want or does not do.
The private sector's only function is not to create employment, but it also makes a positive contribution to the state depending on the business area. As I said, if fair competition is ensured in the market, private enterprises can make positive contributions in many areas.