To be honest, I'm not an economist either, but I'll do my best. Since it's a Friday night, please forgive me for quoting myself from other threads, but I find that we're beginning to cover this ground quite thoroughly. The summary version: on an absolute GDP basis, China's dominance is inevitable, but on a GDP per capita basis, not so much.
1)
Demographics
Already discussed, I won't rehash here. China's demographics are not good, we all agree. What remains to be seen is if China can reverse the trend. Many have been able to sharply curtail population growth, even the Islamic Republic of Iran, but virtually no one has been able to increase population growth back above replacement once total fertility rates fall below 2.1. Many have tried, virtually all have failed, but China continues to surprise, so who knows.
Meanwhile, the US, through a combination of immigration and focus on families, has a healthier TFR of 2.01, but even we are struggling with this issue (as are are developed economies).
2)
The state of the relative economies
We have discussed this before as well, so I will just post a link to
Chinese Economy News & Updates | Page 261 which is a good summary of the situation. China has done a tremendously good job implementing the Japan/Asian Tigers model of intensive investment and export-led growth, but that stage of development is coming to an end. The proof? @
Raphael just posted a great thread
Conference Board Study: Productivity goes negative as China slips towards middle-income trap about declining Chinese TFP. China will change because China must change; if it does not, China could suffer a Japanese- or European-style stagnant period due to its growing NPL issues. (As detailed in the link I posted in the beginning of this paragraph).
The United States has just recovered from its financial crisis. Banking crises are known to be the most vicious and long-lasting, and this one was no different. That said, we learned hard lessons from Japan, and put them to good use to prevent ourselves from becoming another Japan and losing two decades to a listless, deflationary economy. The United States has recovered from many harsh downturns, but it's an open question whether we have the energy and will to do so again. The US has undergone many mini-revolutions in order to get its economy back on track.
Some smart guy said:
"The US was down and out in the 1970s. Then the successive financial revolution, re-engineering revolution, and internet revolution re-ignited American growth, and the distance between the US and other industrialized nations started growing again. In the 1970s, China was an economic dwarf. Think about how much can change in 50 years, and then examine if you can still be confident in your assumptions about the next 50."
Source:
The diplomatic battle between China and Japan is taking a Latin American road trip | Page 2
Unlike China, these revolutions are not planned, but rather are the macro results of individual innovation, and the discipline that invisible hand of the market enforces. Some wonder how long our "luck" can last, but it is rather the innovation that springs from the chaos of competition that provides us with these opportunities to change. That is the strength of the US, and potentially the weakness of China. China has smart leaders--today. China's leaders make the right decisions--today. But what about tomorrow?
Meanwhile, the US has stupid leaders who make the wrong decisions; but our system has historically been decentralized enough that we could thrive despite these incompetents. The difference today is that the accumulation of deadening regulation has been preventing the kind of open competition we need to drive that next phase of change. I mentioned renewable energy and smart grids as the next phase of industrialization in another thread, but this will not be possible if government regulation of utilities deprives them of the profits needed to make the investments in smart grids, or if the government picks winners and losers among the renewables through subsidies instead of allowing the market to decide what form of renewable energy will best serve our needs.
3)
Stage of development and precedents
China has done well in its "catch up" phase, but now it's entering the leadership phase of economic growth. It has to innovate to stay ahead of competitors, since its cost advantages are rapidly diminishing. To recycle what I said in regards to the demise of Japanese competitiveness , "It's easy to catch up to the leader. It's hard to take over as leader. Leadership, or our focus here, innovation, requires constant questioning of the status quo, and an embrace of risk to push the boundaries of what is possible. Neither of these factors suit Japanese society well, until Japan is forced to embrace them."
Source:
What happened to all Japanese Electronic Giants? All of them are about to collapse! | Page 8
I think it's fair to say that this is also partially true of China, in that China proceeds on its course until it is forced to change. I believe that China has a much stronger risk-taking culture than Japan, though, so it may have an easier time making the transition to the next stage of the economy. Here's a nice chart:
China is making the transition to a developed economy, and the US is already post-industrial. China's challenges are to break down its SOEs and make the economy more competitive by opening opportunities to SMEs, all the while strengthening the financial system and the rule of law. After all, China can't expect to derive profit from its R&D activities if its companies are stealing IP from each other, and other countries are stealing China's IP in retaliation for its weak protections. This is Xi's task, and we are waiting to see if he will succeed with his reforms, or stop at the populist measures (anti-corruption).
The US has its own challenges as a post-industrial nation. As I have already pointed out, regulation is too complex, and too heavy, to enable the free market to function properly. Our demographics are better than China's, but not looking great. We already leveraged up our economy to juice growth, and paid the price, so that avenue is no longer available to us. That said, we have a track record of innovation that drives productivity growth, and it is our challenge today to foster that next wave of innovation and exploit it when it comes along.
4)
Conclusion
Europe hit the wall, and hasn't been able to reform successfully. Abe talked a good game, but never implemented his "third arrow" of structural reforms, so Japan is hitting the wall. The United States is burdening its economy with higher taxes and Obamacare, so we're moving--for now--in the wrong direction, but the pendulum always swings to extremes in the US before the correction comes. China is making the right announcements, but execution is key (and I am not talking about corrupt officials, here). I do believe that China will return to its historical place as the largest economy in the world, but I don't believe that the US will become as decrepit as Europe or Russia. The main question isn't about the distance between China and the US, but rather the gap between China and the US vs. the rest of the world.
@
Nihonjin1051 As far as your discussion about GDP per capita, I agree with you. That prospect is so many decades away that too much can happen between now and then to make interesting projections. The precedent of Argentina presents itself, though--around 1900, it was one of the richest countries in the world, and even after over 100 years of incompetent management, it is still a middle-income country. It's easy to get rich, it's hard to become poor once one is rich. For that reason, I don't see a significant US decline in the cards.