I have few doubt about ETF
Basically i understand that ETF is a invested in collection of shares based on index or sector or similar kinds. These come with some value as traded in the Stock Market.It moves up and down according to the base its invested on and the trading in market.
My question is how does the no of units in an ETF is fixed at first?
In case of company which is in secondary market it based on base captial and they dilutions so far. In case of ETF how is this determined?
Also when does no of units for ETF increases or decreases?
What happens when there are no buyers in market to buy my ETFs,,can i give it back to company that sold me?