This weekend, the PBOC announced more reforms to China?s exchange rate regime. While the market has been talking about a possible revaluation of the renmimbi (RMB) for some time, there has been little action from China so far. Point estimates of the RMB's current undervaluation ranges from zero to 30%. The impact on commodities is unlikely to be straightforward, and should depend on how China goes about revaluing the RMB. However, they ware three scenarios:

1. China reinstates the crawling peg system, as before the financial crisis. If this happens, the initial impact should be limited, as currency moves should also be very limited. However, a crawling peg system where the RMB appreciates slowly over time may actually see more money flowing into China, as the market anticipates currency appreciation. More money into China could see their foreign reserves build even more, amplifying global liquidity that is concentrated in China?s global reserves. This should favour the longer-term prospects of gold (but also most other commodities in general), given gold?s close relationship with global liquidity and the continued accumulation of liquidity. It would also make RMB-denominated commodity prices cheaper than what it would have been if the RMB was pegged against the dollar. At the margin, it could benefit commodity demand from China.
2. China makes a one-off, large revaluation, of say 15% to the RMB. The immediate impact could see a rise in demand for commodities from China ? simply because all dollar-denominated commodities would suddenly be 15% cheaper for China. This should favour commodities with large exposure to China, e.g. copper. However, a significantly stronger currency means tighter monetary conditions and over a couple of months a stronger currency may start weighing on China?s trade balance. China is likely to import more final goods and export less. With a smaller trade balance (or even a negative one) there could be lower GDP growth and less demand for commodities. This may be the case in particular if spending emphasis shifts from government?s capital expenditure to consumer final consumption expenditure.
3. China goes for a full-blown floating currency. Should this happen, and say the RMB is currently undervalued by 20% the initial effect may be similar to Scenario 2. The difference would be that China's growth in reserves may end suddenly. A stronger currency should see a knock-on effect on the Chinese trade balance. Their foreign reserves will not disappear but the massive rise in reserves every month could slow substantially if the currency appreciates by a great margin. Furthermore, their dollar denominated foreign reserves becomes less in RMB which could even slow government spending. After a few quarters, demand for commodities from China may slow as growth tapers down.

I believe Scenario 1 should be China?s preferred option. China have try hard to not revalue RMB sure they know the effect on China economic. The delay sure because revaluation of RMB did not benefit much to China.