![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbpLxbyQE5ud9fsoPpr_cuGGeLGiaGWnOEYDfBCKjYX9lVXSfO-tpLuHdZCdOL0gJXe4BAThCzpWf2WW9-u7nA66daNhAYScsVXlGGVN2skKQBmAqoQRrePaNtekSEBTmJlscVEjF1U67h/s400/SPX_30+04+2010.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj45rnPMoTjc1C7av0EbrISP-UnqiKkO5AADLtA2j_WkvIBpa-j45T2hmS_rjqQcrbunmx8cge9F4t43RCarrHltagEz9IJxB4OhTkowkwtOl56qVVEAAMdTcRdQ4p7FlrpZUIgxWCR5R1T/s400/SSEC_30+04+2010.jpg)
Let's look at the two weekly charts above: one is the S&P500 index (500 biggest market caps in USA), the other is the Shanghai index.
The Shanghai index has acted in the past as a leading indicator as China is seen as the economic motor nowadays : it is the country with the highest GDP growth in the world. However this index is now lagging compared to the S&P500 index: the S&P500 is above the 40 week moving average whereas the Shanghai index started going under this moving average 2 weeks ago. This raises a red flag: a price divergence between these two indexes is a concern for any trader.