 100 years from 1950 we're gonna have 8.9 billion population which is more than triple of the back in 1950 so very rapid growth of the population on the global basis but at the same time since late 1990s and beyond population particularly in matured countries are aging so we are facing two problems simultaneously if you look back you know many matured country developed countries economic growth when economy economy was rapidly growing population was growing as well so this population growth and the economic growth come hands-in-hand together in most of the countries but those days are over for matured on the developed countries just like country like China because of the one child policy their family is gonna be a four to one type family four grandparents two parents one child can you sustained the social welfare system or social security system with this kind of family family structure no way while you see you know population growth in neighborhood countries just accept immigrants from those countries that's a win-win situation but because of the some difference difference in culture or mentality or resistance from the people none of the countries have done this well enough with a few exceptions so what other insights have you developed in trying to solve the problem beyond immigration they have to be prepared to raise the tax this countermeasure is not so popular either people don't appreciate it you know extend the retirement age the developing countries have to help one another by sharing not only their wealth but also technologies and ideas and also accepting immigration if we don't tackle on this and fix this problem or at least show the way how to solve this problem we are you know leaving very bad negative legacy to our next generation