City-dwellers often don’t use their cars for days or weeks at a time. That idle time can translate to money with services like Getaround and Turo, which let you rent out your car by the hour or day. Earning potential varies by car and location, but standard vehicles typically rent for $30 to $50 per day. Luxury cars and sport-utility vehicles command even more money. Just be sure you talk to your insurance provider before signing up to make sure that you don’t run afoul of the policy.
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Salvage and resell. Do you love antiques or have a knack for finding valuables at flea markets or yard sales? If you do, it might be time to consider salvaging items for resale – or even scouting out antiques to sell for a profit. While you’ll need to spend quite a bit of time searching for prospects and spend some money buying upfront, you could easily turn a profit if you know what you’re doing.
Amazon makes it fairly easy to list and sell old books on its marketplace. You can make more than just a few bucks If you have pricey text books from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart. Remember, add value where you can, no matter how small it might be and no matter how few people might readily notice it. 
Jack up your prices. If you're providing a skill, service or product that is in high demand and low supply, and you're making the most of your time, you should be making good money. Unfortunately, there are many people who are too humble or fearful to demand that they get paid accordingly. It's the pushovers in life who get taken advantage of and exploited, so if you think you might be one of them, learn how to stop being a people pleaser. If you work for someone else, ask for a pay raise or get a promotion, and if none of that pans out, revisit your career options as described previously. If you're self-employed, the first thing to do is to make sure your customers and clients pay up on time--this alone can substantially improve your income. Check your prices and rates against those of your competitors--are you undercutting them? Why? If you're providing a superior product or service, you should be getting at least the average, unless your profitability depends on mass production, in which case you're probably making a lot of money and wouldn't be reading this article anyway!

The cash back industry is ruthlessly competitive, isn’t it!? All these apps want new users, which means you can load up on welcome bonuses. The Ibotta app is another opportunity to get a bonus: they are giving people $10 when they sign up. Unlike the other apps mentioned in this article, Ibotta specializes in getting you cash back at grocery stores.
Do you love getting refunds? How cool would it be to get money back on stuff you’ve already bought? Paribus is a service that lets you find out if stores you’ve shopped at online owe you a refund.  It’s free to sign up. Paribus connects to your email account and checks your receipts.  If they find out a retailer has dropped their price they file a price adjustment claim for you.  Try out Paribus.
Being a Loan Signing Agent is a great side hustle because you can make $75 to $200 per hour-long appointment working for yourself on your own schedule. Retired people, working professionals, and students can be signing agents and earn extra cash when they want. The best part is you need nothing more than a notary commission (which can often be attained by simply filling out an application)!
Sell your courses on platforms. A lot of new entrepreneurs try to sell courses on their own websites but fail to get the traffic to it. Having your own website is a great opportunity to build your personal brand as an influencer. However, if you’re starting out for the first time, your best bet for monetizing your online course is to add it to a marketplace. If you’re an experienced marketer with a sizable audience, you might choose to host it on your own website. And do it successfully.
Amazon makes it fairly easy to list and sell old books on its marketplace. You can make more than just a few bucks If you have pricey text books from college. Be sure the books are in good condition. You'll get negative reviews if you attempt to sell books that are falling apart. Remember, add value where you can, no matter how small it might be and no matter how few people might readily notice it. 
As you likely know, Airbnb is a popular website where people can rent out a room or apartment from ordinary folks and bypass a hotel. So, if you’re comfortable with strangers and you live in fairly well visited place — a large city, college town, or tourist area, for example — you could make some money renting out a room in your home while you’re there, or renting out the entire place while you’re gone. You can expect to make less than whatever nearby hotels charge, but that can still top $100 a night pretty easily. In fact, Airbnb is the most lucrative of all the sharing economy gigs, according to one study.
Those who love teaching but would prefer to make passive income could consider teaching online courses. With online courses, you can teach topics that go beyond what a tutoring gig for students would teach. If you’re great at building stable relationships, you might create a relationships course. If you’re an ecommerce expert, you might teach a course about dropshipping. There’s no limit to what you can teach. You can also niche down within an industry to teach courses about specific subtopics. For example, instead of teaching public relations you might teach a course about growing your blog traffic.
Saving Money is Making Money.  You may have heard the saying “You can’t “outwork a bad diet”; finances are similar. Before launching your side hustle, it makes sense to sit down and look for opportunities to reduce unnecessary expenses. Now, I’m not suggesting you give up the items you and your family value and enjoy, rather let’s just trim the fat a bit.
You can earn quick money by registering to InboxDollars. You’ll get a free $5 bonus when you sign up! You may have to wait a bit longer to get to $100, but it’s still easy money by doing things you do online anyway, like listening to music (yes seriously), watching ads and a variety of other things. Plus, you get $5 just for signing up (just name and email address). 
Search engine evaluation - Almost everyone uses the internet in day to day activities and being paid to hang out online can put a smile on your face. Search engines such as Bing, Yahoo and Google use human skills to authenticate search engine results produced by complex algorithms. It is a simple online job because all you have to do is type word phrases into a search engine and then assess the relevance of the results.
Manage social media for businesses. If you have a knack for social media, you could potentially get paid to manage various platforms for others. Many businesses are too busy running day-to-day operations to stay on top of their Facebook, Twitter, and Pinterest accounts – and will pay someone with the knowledge and time to do it for them. To find these jobs, ask local businesses and check sites like UpWork.com and Problogger.net.
You could try advertising more, for example, by putting up signs around the neighborhood, posting about it on social media, or having people you know spread the word. You could also try doing it in a different neighborhood that might have friendlier people, or do it in a time and place where there's likely to be a lot of people walking around the area (e.g., near a church before the end of a mass).
It depends on where you live. Many public places will require you to have a permit for sales. However, in a nice, family-friendly neighborhood as a kid, it would likely be fine. If you plan on selling street-crafts for a living, find out what the local regulations are and look into the costs of a stall, half shipping container or other form of suitable "pop-up shop" because you will be out there in all sorts of weather and you'll need to protect the crafts.
Start analyzing your decisions from the perspective of a firm. In economics, a firm's goal is simply to maximize profit. Well-run firms spend money only if they can expect to make more money from their investment, and they allocate their resources to the most profitable use. You're not a firm, of course, and you have other considerations, but if you make the majority of your time and money decisions by choosing the options that promise the highest return on investment, you'll likely earn more money, and that's good news for your shareholders (you and your family).
Do you do a ton of shopping but don't always keep track of prices after the fact? Did you know that prices online change all the time, and most merchants have a price guarantee program? Paribus is a service that lets you find out if stores you’ve shopped at online owe you a refund.  It’s free to sign up. Paribus connects to your email account and checks your receipts.  If they find out a retailer has dropped their price they file a price adjustment claim for you.

Regardless if you need to earn some fast cash or we're just talking about making money in the grand scheme of things, there's an important psychology that needs to be mentioned before getting into the strategies. If you study Freud's model of the mind, you'll discover the Psychic Apparatus. It's the three-part construct in your mind that controls all of your behavior.
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