From Investopedia: A security giving stockholders entitlement to purchase new shares issued by the corporation at a predetermined price (normally less than the current market price) in proportion to the number of shares already owned. Rights are issued only for a short period of time, after which they expire
advantage priority in income less risky investment stable market price
There is no way to predict the price movement of shares unless you are part of the game. However, you can guess if you have suffecient experience of monitoring shares movement.
stock price
they cause the price to drop
The market price of shares varies each day.Market Value definition :(1) The price at which a security is trading and could presumably be purchased or sold.
From Investopedia: A security giving stockholders entitlement to purchase new shares issued by the corporation at a predetermined price (normally less than the current market price) in proportion to the number of shares already owned. Rights are issued only for a short period of time, after which they expire
they cause the price to drop
As shares come into more demand the price of them goes up.
I believe what you are referring to is when a corporation buys back it's own stock resulting in less authorized shares in the marketplace. This doesn't have a direct effect on a stocks price but can typically indirectly cause a stocks price to increase. The reason that it is not direct is that the company must spend it's own money to buy back the stock. This results in less shares and each shareholder now holds a larger stake in the company but the resulting company now either has less cash in it's reserves or has issued debt to pay for the stock. Indirectly this can help the price of the stock. The fact that a company is buying it's own stock back would indicate that the company feels it's own shares are a bargin at the current price. It also adds support to a stocks price in that if the price begins to fall due to market conditions the company can step in and buy shares to prevent or limit continued stock depreciation.
there is no name for it so people just say less 50 shares
These are special shares that you get with ordinary shares from some companies, which they buy back off you at a price instead of paying a dividend.