SET weekly: top with marginal breakout suggests a 10% downside. This is a fair probability, given the weaker volume attending the second top.
A fall below 1220 would break a larger top with a further 36% downside from the breakout point, or a target of 780. However, volume on the second top is much greater on the second large top than that of the first top, mitigating against the scenario. Nonetheless, given the high PE for the SET (around 20) it would be well to keep an eye on this scenario.
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