If you have saved up to a certain amount, it might be fun to see how long you could live on your money - without working or otherwise earning money beyond the return on capital. Here you can count on this, and at the same time choose an interest rate on the remaining money.
Capital gains tax of 30% is deducted from the interest every year, to simulate a savings account. If you instead save in securities in a securities depository, the tax depends on the purchase price.