Bank Nifty on Weekly Chart

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Last week candle was not able to sustain above its supply zone @ 21150-21800. Even it failed to close in this supply zone.

On the downside, there is a demand zone @ 19500-19650 and weekly close is above this zone.

In any case, weekly close below 19500-19650 another 1500-2000 points downside range will open.