The abstraction ignores the linear throughput of matter and energy that must power the continuous motion of money, goods and services, and factors of production. Matter and energy enter the economy in the form of low entropy natural capital, such as solar energy, oil wells, fisheries, and mines. These materials and energy are used by households and firms a like to create products and wealth. After the material are used up the energy and matter leaves the economy in the form of high entropy waste that is no longer valuable to the economy. The natural materials that power the motion of the circular flow of the economy come from the environment, and the waste must be absorbed by the larger ecosystem in which the economy exists.[20]
For those willing to take on the task of managing a property, real estate can be a powerful semi-passive income stream due to the combination of rental and principal value appreciation. But to generate passive income from real estate, you either have to rent out a room in your house, rent out your entire house and rent elsewhere (seems counterproductive), or buy a rental property. It’s important to realize that owning your primary residence means you are neutral the real estate market. Renting means you are short the real estate market, and only after buying two or more properties are you actually long real estate.
In fact, any type of digital artwork could be sold on Etsy. If you end up taking up photography, or you’re an aspiring photographer or professional one, you could also sell your photos through Etsy as digital downloads. From vintage artwork to photography and motivational prints, you could sell any number of style of digital-only products through Etsy.
Many people talk about passive income and create the impression that you never have to do anything to keep that income going. The truth is that you will normally have to keep your eye on things if you want it to run smoothly. For example Richard Branson doesn’t run any of the 400+ companies he started but he goes over the numbers each day to make sure they’re performing well and calls the CEO if there are any problems.
You aren’t going to get rich overnight by creating YouTube video tutorials, but there’s a lot that you can do with YouTube videos to generate passive income online. The first thing that people think about when it comes to YouTube videos are the Adsense revenue streams. However, don’t get your hopes up unless you expect to have millions of views for that video.
When you build a business, you're giving up active income (instead of working for pay, I'm volunteering at my own business) for future active and passive income. In the meanwhile, you'll need a way to pay for your expenses. It could be that you're building a business on the side, so you still have a day job, or you're living on those savings. Either way, you need a cushion.

However, not all of us use the time that we have wisely. In fact, we often squander it. We waste time with trivial pursuits, enthralled in things that don’t help to advance us towards our goals, or steeped in one bad habit after another, wallowing in self-pity and lamenting that there simply isn’t enough time in the day. In fact, you can tell a lot about a person by the way they use their time.
One of the benefits of the time we live in is all the software and technology we have available. If you want to scale a business that’s bigger than yourself, you’re going to need systems in place to get you there. These systems should involve automating as much as you can. The less involvement of you in the day-to-day means you have time to focus on the big picture strategies that help your business grow. 
The obvious way to earn a second income is to get a part-time job. If you are not currently working, this is an excellent way to start as it gives you the freedom and flexibility to start other passive income opportunities.  The other option is to simply work from home full time which frees up commute time so you can focus on building more income streams.
Many people talk about passive income and create the impression that you never have to do anything to keep that income going. The truth is that you will normally have to keep your eye on things if you want it to run smoothly. For example Richard Branson doesn’t run any of the 400+ companies he started but he goes over the numbers each day to make sure they’re performing well and calls the CEO if there are any problems.
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