However, this comes back to the old discussion of pain versus pleasure. We will always do more to avoid pain than we will to gain pleasure. When our backs are against the wall, we act. When they're not, we relax. The truth is that the pain-versus-pleasure paradigm only operates in the short term. We'll only avoid pain in the here and now. Often not in the long term.
If an investor puts $500,000 into a candy store with the agreement that the owners would pay the investor a percentage of earnings, that would be considered passive income as long as the investor does not participate in the operation of the business in any meaningful way other than placing the investment. The IRS states, however, that if the investor did help manage the company with the owners, the investor's income could be seen as active since the investor provided "material participation." 
If your research really does determine that there is some amazing market niche that until now has miraculously gone unnoticed and unserved---dog owners who wish to help their dogs lose weight naturally, for example---sooner or later, word is going to get out that there's money to be made there, and someone is going to create a better ebook or info course or product that serves that market's needs better than yours does, and who markets it better to them than you do. You can't manage this competition while sipping margaritas all day from your paradise restaurant on Fiji. You'll soon see your market share go down the drain---just like all those Açai cleanses. . .
Few real estate investors pay all cash for their properties. One of the biggest benefits to the real estate business model is the ability to buy on borrowed money and writing off the interest as a business expense for taxes. Without the leverage of financing, my experience is that the return from real estate investing is not worth the risks or headaches.
After these tenants move out, I'm thinking of just keeping the rental empty with furniture. It sounds stupid to give up $4,200 a month, but I really hate dealing with the homeowner association, move-in/move-out rules, and maintenance issues. Given that the condo doesn't have a mortgage and I have to pay taxes on some of the rental income, I'm not giving up that much. The condo can be a place for my sister, parents, or in-laws to crash when they want to stay in SF for longer than a week or two.
It’s like if you met someone for the first time and the first thing they ask you is if you’re interested in buying something from them. I’d much rather get to know somebody first, trust them, and then have them tell me what they might have to offer. Or better yet, be genuinely interested in what they’re doing, and ask them about it myself. This is the kind of philosophy that I use when promoting other people’s products.
So, armed with my real estate license and this desire to help physicians (and create a business at the same time), I started a real estate company called Curbside Real Estate. My goal was to help physicians buy and sell homes by connecting them to trusted realtors and lenders. It started organically, largely through word of mouth. Next thing you know, I was helping doctors from coast to coast. The business was great and I felt I was making an impact helping physicians, but I still wanted to own my own real estate investment properties.

I like the way you have listed the ways to earn extra income and was quite surprise that you did not make mention of network marketing, which is a way to make extra income without quitting your regular, though most people view mlm as a pyramid scheme but the real pyramid scheme is a regular 9 to 5, because you can only have one president of a company at any given time and network marketing business model to promote product that can be used is really cheap to join and can offer a substantial extra income or what do you think?
Depending on how many rental income properties you have and your experience with home improvement, you may be able to do a lot of the maintenance yourself. You likely won’t be able to fix everything but it will be worth it to learn a few common repairs to do yourself. Typically, plumbing and electrical maintenance will cost the most since work is generally restricted to licensed members of the trade unions.
Unless you live nearby and genuinely enjoy doing maintenance work, you will probably want to hire a property manager to oversee your investment. Do some research on any potential management company. You should look at the number and type of properties the company manages, as well as how many properties each individual manager handles. If this last figure is higher than 250, it’s likely your property may not get enough attention.
There are dozens of ways to generate passive income. However, the option you select has to do with two metrics: time and money. Either you have a lot of time or a lot of money. Most people usually don't have both. But, if you have a lot of money, generating passive income almost instantly is easy. You can buy up some real estate and begin enjoying rental income. Or, you can invest in a dividend fund or some other investment vehicle that will begin generating a steady income for you.
Freelancing is on the verge of going mainstream. Thirty-six percent of the international workforce now freelances, at least part-time. There are also 40.9 million adults in America who are self-employed. Clearly, freelancing is catching on. But with rapid growth come certain challenges, one being an increased competition for well-paying job and price reduction by those who think they can afford low-bidding at least for now. https://www.listenmoneymatters.com/wp-content/uploads/2017/08/LMM-Cover-Images-1.jpg
A passive income stream is one that, once put in place, earns income for the owner without needing much more additional effort. Passive income streams are a good way to supplement your income because they are inexpensive to create, low risk, easy to duplicate and make money any time of day. You can earn passive income on money you invest or property you rent out, but many people earn it over the Internet.
However, this comes back to the old discussion of pain versus pleasure. We will always do more to avoid pain than we will to gain pleasure. When our backs are against the wall, we act. When they're not, we relax. The truth is that the pain-versus-pleasure paradigm only operates in the short term. We'll only avoid pain in the here and now. Often not in the long term.
My esteemed marketing colleagues initially balked at the idea of creating products that generate royalties, so I can understand how creating something from nothing might be daunting for those who aren’t even in creative roles. However, realize there is this enormous world out there of photographers, bloggers, artists, and podcasters who are making a passive income thanks to the Internet.

Also, if you pursue an income stream like affiliate marketing, your blog can be a source of content that allows you to link to affiliate sites in a way that is seamless and natural. For example, if you are an affiliate marketer for a company that sells productivity tools, you can blog about your own struggles to stay on top of your to do list. Then, you can mention how much those tools have helped you.
I get excited every paycheck because I know my investments are going to increase by a decent chunk. I use Mint to keep a close eye on what the current value is at and make goal marks to hit. Every time I hit a goal, I do a little happy dance and decide what I want my next marker to be and when I want to hit it by. I’m nowhere close to being financially independent or even debt free, but it’s exciting to see the ground work being laid and watching it grow.

Passive income is an incredible tool that everyone should include in their retirement plans. With traditional investing you have to rely on the stock market to increase your investments over time. The longer you have your money invested, the more your money will grow. The stock market does not produce passive income, except in the form of dividends. Most dividends are extremely small and produce small returns on investment. The bulk of stock market returns come from an increase in stock market prices. The only way to realize those increase in value is to sell stock. Retirement calculators that use the stock market as an investment plan on you running out of money when you die because you have to sell all your investments to keep bringing money in.
Given the growth in the sharing economy, your junk can start to pay for itself. For example, if you have some awesome vintage furniture inherited from your grandmother sitting in a storage unit, you can rent this out to photographers for their “styled shoots” which are becoming all the rage. If your furniture is more modern but you still can’t bear to get rid of it – perhaps a home stager will be interested.
Okay, back to our topic today: If you’re struggling to figure out how to make money online FAST—in a way that focuses on your strengths—that’s how you do it. Think about the resources you have available to you, the skills and talents you have, the superpowers that you’ve so severely underrated these past years, and journey out there to find those people who are looking for the resources and skills you offer. They are out there.
If you’ve ever thought to yourself, “I wish there was a product that did this,” then invent it! Create a product, medical or otherwise, and sell it as a company or get royalties for it. It’s not impossible to figure out, I have many friends who have taken a concept to market. Don’t overlook an invention as a fantastic means of attaining passive income.

If you love design and you are an artistic person, selling digital products on Etsy could be a great way to earn passive income. Digital products require little maintenance, your customers will simply receive a link to download them (which means you don’t have to worry about shipping and returns handling). All you need to do is spend time upfront to create beautiful artwork! (Easy right?)
Let’s continue the vintage BMW idea. Old cars obviously require quite a lot of maintenance. Many people will buy a “fixer upper” with the intention of spending their spare time repairing and restoring it. There’s a very obvious market here: a guide to restoring different BMW models. Depending on your knowledge, you could produce detailed guides for the three or four most popular models and sell them. Not everyone restoring a car will buy them, but some probably will.
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