In the European and USA session it has a 99% correlation with the NIKKEI and is one of the most algo'd markets in the world.
It is a market for scum and scum-minded bottom-feeders;
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If you really believe you have edge in the TOPIX then you probably have intricate knowledge of the different companies listed in it and their relative value to the listed companies in the NIKKEI.
You already probably know these, but for anyone else curious;
The TOPIX is a wider representation of the Japanese stock market because it weights off the free-float of shares.
Nikkei component weighting;
44% technology (Toyota is considered a Technology company),
20% consumer goods,
16% materials....
TOPIX component weighting:
12% Transportation equipment,
12% Electric appliances,
10% Banks
(7-4%) I., Chemicals, Machinery, Retail... Food etc.
Although, if you really had knowledge of those sectors, you should be trading the individual shares (or spreading the indices).
For the past 4-5 years, it has had a total net deviation of
+/- 4.5% against the Nikkei, which can be seen from my chart;
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Important.. you can't miss one of the most algo'd things in the world;
Put up a ladder of the Topix or Nikkei with Yen together and you will see that they move inverse in a very aggressive way due to the insane amount of scabby algorithms. Here's a 60-minute chart showing the insane correlation of TOPIX vs. (1/Yen) (CQG code: 1/JY6)
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If you really have edge in trading a single leg of the Nikkei, Topix and Yen then it would not matter which product you choose.