What are the factor that affect the Sensex?

The Sensex is an "index". An index is unsophisticatedly an indicator. It give you a standard concept just about whether most of the stocks enjoy gone up or most of the stocks own gone down. The Sensex is an indicator of adjectives the primary companies of the BSE.
The Nifty is an indicator of adjectives the highest companies of the NSE.
If the Sensex go up, it vehicle that the prices of the stocks of most of the foremost companies on the BSE enjoy gone up. If the Sensex go down, this tell you that the stock price of most of the crucial stocks on the BSE own gone down.

Answers:
Though crude, the reply of Brahmo could be intensely right!!

There are tons more number of reason to affect the Sensex than the number of scrips scheduled on it.

For rest of the your narration, the answer could be "may be but not always"
A sneeze in Dow Jones. A fart in Taipei


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