Harv
Emperor
- Joined
- Dec 16, 2008
- Messages
- 1,987
Here is my best understanding about how bubbles work:
1. Money is borrowed against an S&P500 Index Fund to buy more shares.
2. The price of the S&P500 Index Fund goes up, allowing you to buy more shares.
3. Back to 1.
So the price keeps going up because demand is driven by more and more borrowed money. The cycle feeds on itself until the stock prices stop going up. When they stop going up and start going down, then the cycle works in reverse:
1. S&P500 Index Fund shares are sold to pay off money borrowed against the same S&P500 Index Fund shares.
2. The price of the S&P500 Index Fund shares goes down, reducing the value of the collateral and forcing more selling.
3. Back to 1.
The down cycle is faster than the up cycle because the selling is forced and the buying is mostly volunatary.
With that being said - I do not believe the existance of S&P500 Index Funds would cause a bubble on their own because demand is driven by popularity and not necessarily borrowing. The effect of the popularity of S&P500 Index funds would then be to increase the popularity of S&P500 stocks. Therefore, stocks inside the S&P500 will (theoretically) trade at a premium to stocks outside the S&P500. So what happens to a stock's price when it is added to the S&P 500 and the index funds have to buy it?
1. Money is borrowed against an S&P500 Index Fund to buy more shares.
2. The price of the S&P500 Index Fund goes up, allowing you to buy more shares.
3. Back to 1.
So the price keeps going up because demand is driven by more and more borrowed money. The cycle feeds on itself until the stock prices stop going up. When they stop going up and start going down, then the cycle works in reverse:
1. S&P500 Index Fund shares are sold to pay off money borrowed against the same S&P500 Index Fund shares.
2. The price of the S&P500 Index Fund shares goes down, reducing the value of the collateral and forcing more selling.
3. Back to 1.
The down cycle is faster than the up cycle because the selling is forced and the buying is mostly volunatary.
With that being said - I do not believe the existance of S&P500 Index Funds would cause a bubble on their own because demand is driven by popularity and not necessarily borrowing. The effect of the popularity of S&P500 Index funds would then be to increase the popularity of S&P500 stocks. Therefore, stocks inside the S&P500 will (theoretically) trade at a premium to stocks outside the S&P500. So what happens to a stock's price when it is added to the S&P 500 and the index funds have to buy it?