If, by "invest in" you mean 'put up the money to establish one and thereby profit from the investment' - yes. One can invest in a medical practice the same as they would invest in any other kind of business. Unless the investor is actually practicing medicine they need not even be a medical person.
Anyone
yes
Usually there are no restrictions as to who can invest in a particular type of fund. If you are asking, who would want to invest in banking funds, the answer is: anyone who feels that the banking industry will continue to grow and generate profits for the investors can invest in them.
Some are, some aren't. Anyone can invest.
Anyone can invest in a business if that is what the owner wants. There will have to be an agreement on how much money will be invested, the investor's role in the business, and what percentage of the business that they want.
There are many people who are engaged in home based employment in the state of Missouri but it depends on one's income to invest the amount of time needed for the job.
Public Limited Company
publicly owned corporation
Public Limited Company
Stockholders are individuals and businesses that on stock in other businesses. Anyone can become a stockholder if they have the money to invest.
For investors who want to invest in something that has more than just nominal value but perhaps aesthetic value as well, the alternative investment market has something for just about anyone with a taste for the exquisite.
Anyone can invest in the stock market! I am a recent college graduate in finance and am amazed at all the things i was able to learn. I want to help others to know what i know and start benefiting from it!