I do buy whenever the market falls as you get a good price and also another thing people do panic selling which helps as price further falls and this is a sort of opportunity which many big investors await and grab it.  Thus generally if you see later on in some days market may rise back again and you can gain it and can sell some and book profits or if long term investors can hold it and continue buying whenever their is a little dip irrespective whichever day it may be .