4. Cost-effectiveness: Since the initial requirement is considered a very minimal investment in most cases, mutual funds are accessible to all types of investors. 4. Cost-effectiveness: Since the initial requirement is considered a very minimal investment in most cases, mutual funds are accessible to all types of investors. 4. Cost-effectiveness: Since the initial requirement is considered a very minimal investment in most cases, mutual funds are accessible to all types of investors. 4. Cost-effectiveness: Since the initial requirement is considered a very minimal investment in most cases, mutual funds are accessible to all types of investors. 4. Cost-effectiveness: Since the initial requirement is considered a very minimal investment in most cases, mutual funds are accessible to all types of investors.