Bob wants to buy Ethereum. He only has Bitcoin. On an instant-access exchange, he will trade Bitcoin for Ethereum. He will provide the target address of his Ethereum wallet to receive the Ethereum he wants to purchase, and he will also provide a refund address for Bitcoin, most likely the address from which he will be sending his Bitcoin to the exchange. Once he will submit the order, Bob will be asked by the exchange to send the necessary amount of Bitcoin to an address. Once he will send this money and it is confirmed, the instant-access exchange will handle all the buy/sell operations on his behalf, and will send the Ethereum once the order has been fulfilled.
To make comparisons between companies, sectors and markets a little easier, there are a number of mathematical models used. The most common and often the most helpful is the P/E ratio. The Price to Earnings ratio takes the share price and is divided by the earnings per share. It is possible to calculate this using past earnings, projected future earnings and with all sorts of moving averages ;-) Therefore, this is one number that it is vital for any investor to know and understand.
You’ll come across an overwhelming amount of information as you screen potential business partners. But it’s easier to home in on the right stuff when wearing a “business buyer” hat. You want to know how this company operates, its place in the overall industry, its competitors, its long-term prospects and whether it brings something new to the portfolio of businesses you already own.