Stock Market
From UE Wiki
Investing in the Stock Market can be quite profitable, but it is essential that you get yourself a stock ticker, otherwise you may miss when the stocks are about to crash.
The ticker (above) can be bought in the Stock Market and it is a handle "tool" to keep an eye out for all the stocks. Another place you can see live price changes of the market, is in U-E Times as per below.
Stocks fluctuate every five minutes, and if they reach a cost of $ 0, they will crash and you will lose all your stocks.