Final answer:
A written waiver for the right to purchase new stock can be irrevocable depending on its terms and applicable laws, with these rights usually pertaining to preemptive or subscription rights of shareholders. Stocks can be purchased on stock exchanges or through online brokers, and diversifying a portfolio spreads investment risk.
Step-by-step explanation:
The right to purchase new stock with a written waiver is typically found in the realm of shareholder rights, specifically preemptive rights or subscription rights. These rights allow existing shareholders to purchase new shares of stock before the company offers them to the general public or other investors, maintaining their proportional ownership in the company. However, whether this right is irrevocable depends on the specific terms outlined in the waiver and the governing laws. If the waiver explicitly states that the right is irrevocable and it conforms with relevant securities laws, then it can be irrevocable. Otherwise, it is generally considered revocable.
To purchase stocks, one can go to stock exchanges where public companies list their shares, or use online brokers that facilitate the buying and selling of stocks. It is important to diversify your portfolio to spread the risk among different assets, which can help protect your investments from the volatility of the market or the decline of a particular sector.