PPP means Public Private Partnership which means Private Players will put investment to build, this investment is the money they had taken in the form of loans from international banks, stock markets etc. Ultimately they have to be paid back and the burden ultimately falls on people. The thing is every penny that comes from outside India is needed to be paid back by all the Indians be it private companies, govt. or public. For every penny given to India (loans taken by private companies + loans taken by governments) is to be paid back by the people with interest. So, the ones who should worry is the people only. The optimum utilisation of buses and MMTS is better right now because we can't support the future investments with not much growth in GDP.