A financial security is any publicly available instrument of investment. That sounds complicated but it isn’t. It includes stocks, like Apple or Caterpillar, commodities, like oil or live cattle, bonds (bonds are papers containing terms of a loan, payable to the holder) like US treasury bonds or bonds issued by a company, and derivatives of these, such as a paper issued by a company committing that company to buy a stock from the holder of the paper some time in the future at an agreed upon price, known as a futures contract.
The prices of all of these go up and down as people try to buy and sell them at the best price they can get. They can buy them in their own names, in the name of a company, or, crucially, in the name of a financial institution, such as a bank or a pension fund.
Most people will consider that these prices only affect the very rich, who directly buy or sell these securities, and that it is not a problem of other people. This is not so.
When you deposit money in a bank, or in a pension fund, there is a problem. In the future, the world will have grown and more people will be buying and selling more things, and the prices of things will have gone up. This means that if they just leave the money in a vault and wait until you get it out, it will be worth considerably less once you do. For this purpose, you could just as well bury your money in an vault buried in your garden, and it would be almost as safe as in a bank. The purpose of a bank or a pension fund is to use the money you give them to buy securities (they can also use it to give out loans, but this is a kind of security, it is buying a promis from the person you are lending money to that they will pay you a greater amount back in the future), so that when you go to take out your money, it can buy you at least as much as it would have bought you at the time when you deposited it, or if not, as close as possible.
So when you are depositing your money in a bank, or a pension fund, you are engaging the services of the bank or pension fund to buy securities in your name, so that when you retreive your deposit, it will be a larger amount of dollars than when you deposited it.
If there is a crash in the securities market, such as there is now, it is not only the rich that lose money, but anybody that has an account with a bank or a pension fund. This means that the things that go on in the world of business, such as the hike in oil prices, affect your money directly, because expensive oil means it will be much harder for the companies you are invested in to make money, and they will inevitably make less.
If your politicians are conducting policies that negatively affect the securities market, the world of business, then it may be the case that they are achieving some goal, like destroying Russia or reducing the amount of carbon in the Earth’s atmosphere. Buty it is definitely the case that they are causing you to have less money.
When the world of business is negatively affected by these policies, it is not only the rich that are affected and lose money, but everybody else, including yourself. You will have to pay a dollar price for these policies. In many cases, the very very rich will benefit, because they are in privileged positions with the government that conducts these policies.