I bet you've heard the term "economic unit," which basically means each one of you! Yes, you are an economic unit capable of producing economic output. Of course, nobody wants to be called that, because the world and our lives are about much more than just mere economic capability. However, you do know that practically whatever you do is input into the economy, right? You take the bus in the morning: you've just paid for part of the bus driver's wages and the wages of the multitude of people it takes to service the bus and the roads it plies. No small feat! You buy breakfast and coffee - same thing. You read a newspaper, use your computer, etc. This is all economic input. Even putting your savings into the bank is economic input! It's inescapable!
Anyway, let's talk about income units today, rather than economic units. Economic units normally focuses on the amount of output that the "unit" can contribute to the overall economy. I want to discuss what is relevant to the individual: which is "income units." You yourself are an income unit, eh? In fact, for most people they only have one income unit, which is theirselves. Well, most people, but I'm sure that most middle-class people have a few other income units - but still, their own self is most likely the major income unit, with the other income units just making up a small percentage of total income.
So, what is an income unit? An income unit is something that is capable of earning money (the equivalent of labor) all on its own. It gives its master (hopefully, you) some money every month, week, year, etc. You yourself are an income unit, because you go out there all on your own and earn and income through some type of activity. Now, for many people, that's where it ends. One income unit, and only one. Commonly, however, there is the stock or share income unit. You own a couple shares in a publicly traded company and that is an income unit for you. Of course, it's still people down there ultimately generating the income, but they're generating for both themselves and for the shareholders. If you have a great stock, it'll go up in value all the time (capital gains) and pay you a dividend (a portion of the company's profits). There you go: income unit.
But, for the more ambitious (if you don't trade stocks or futures or options full time), there are other types of income units available. You have a home, right? Sure, you spend tons of money on it every month in the form of mortgage, maintenance, upkeep... but if you were to own a home that you rented out - ba-da-bing, ba-da-boom - income unit. Ultimately, it is people paying you that income, out of their own wages, but who cares?! It's income and money in your pocket for something that they need. Real estate is a powerful income unit, because like stocks, they can go up in price, pay you dividends... but the most powerful thing about real estate is that you can borrow maybe 80% of the total cost. Of course, the lender (the bank, usually) will make a percentage profit in the form of the mortgage, but everything above that, you keep... even though you only paid 20%. Over time, that gets paid off by the renters, too... so you own more and more of the real estate (equity). AND any increase in value is all yours! Decrease is also yours, too, just to let you know.
More income units? Well, you can own a van and rent it out to a delivery company. As long as you've got your books in order and are charging appropriate rent, you've got income from that investment. How about a burger joint? If you run it correctly and have taken yourself out of the management picture, that equals income unit. My neighbor's friend has three "Harvey's" burger joints in Toronto somewhere, and supposedly, that guy spends about an hour each day at each of his locations and collects about $300 per unit, per day net profit. Not bad income units!
More income unit ideas: vending machines, coin laundries, convenience store, etc. Of course, owning stock in a publicly traded company amounts to the same as owning your own business (and is a heck of a lot easier), but you only own a part of the business. But anyway, that's not a bad way to go, either.