In my (unpopular) opinion, getting a raise is harder than getting a promotion. Think about it from your boss’s perspective, would you rather a) pay more money for the same service, or b) pay more money for additional responsibilities. Alas, if you feel you’re overdue a raise, check out Dr. Randall Hansen’s article on Getting the Raise You Deserve. There are some really useful strategies there.
Similiar to Adsense, Media.net powers the Yahoo! Bing Network Contextual Ads and is probably the second largest contextual advertising company in the world. I've been running some Media.net ads for a few months and the income was very similiar to adsense. Bear in mind that their approval process is a bit more extensive than Google AdSense. -One has to get a certain number of page views monthly to get an account with them.
A freelancing service is something that can, with the right strategy and action, turn into something more productized and passive. Brian Casel, featured guest on SPI Podcast Session #158, talks about how he was able to turn his stress-inducing one-on-one design service business into something that was actually more productized, passive, and profitable. I highly recommend you listen to that episode if you have a service-based business and you feel stuck.
With just a few paint and stencil supplies you could walk the neighborhoods with curbs and solicit your curb number painting services. Obviously, you need to be somewhat handy with a can of spray paint and stencils, otherwise, you might have people coming after you if you mess up their curb. That said, there is a business for this as people are out there making it happen.
Earn cash back for shopping. Earning cash back on your purchases is a smart idea, and credit card rewards aren’t the only good cash-back strategy out there. With sites like ShopAtHome.com, eBates.com, and TopCashBack.com, you can earn up to 10% cash back on purchases made with approved merchants. Many frequent shoppers also love the Ibotta app, which lets you earn cash-back on every purchase.
Survey Junkie is among the most straightforward survey sites out there, which puts them at the top of this list. All you have to do is sign up to be eligible for surveys. Once you complete a survey you earn a certain amount of points that you can exchange for cash paid directly to a PayPal account or you can redeem your points for gift cards. Super simple.
Do you think it’s possible to build a blog from scratch, outsourcing the work from day one (assuming I have some cash that can cover the initial expenses until the blog generates enough income to at least break even)? In other words, do you think you could you have spent your $500 max per month for the writer, social media expert, etc to build your blog to the point it’s earning the same amount of money it does now?
Consider selling in lots. A lot is a collection of similar items that is sold in a group. For example, if you have a collection of books, magazines or similar pieces of jewelry, consider selling them all at once in a lot. You many not make as much money as you would have if you sold each item separately. However, the items will likely sell more quickly in a lot than they would individually.[29]
You can also sell your own products. You can make music in Garage Band and sell it in iTunes, you could write an eBook and sell it within Amazon. You could also do your own crafts and sell them on Etsy or design a Tshirt and sell them on spreadshirt. Or you could do all of these things! Ecommerce is a great way to make passive income online, whether with a physical product or digital product.

Maybe such a business is owning a McDonald’s franchise or something. If one has the capital (Feasibility Score 2), then the returns might be good (Return Score 6). But the Risk Score is probably under a 5, b/c how many times have we seen franchise chains come and go? Like, what happened to Quiznos and Jamba Juice? A McDonald’s franchise was $500,000… probably much more now?

Etsy: While Etsy's popularity has declined recently, it's still a great resource for selling handmade items online. No need for complex ecommerce sites or merchant accounts or any sort of automation. The company takes a commission of every sale and charges a small listing fee per item. But many still use Etsy as their primary source of income. The best part is that you can also sell digital products on here such as poster designs. 
You’ve probably heard of affiliate marketing before – it’s when you earn a commission by promoting a product. The product you promote online should be something you’re knowledgeable about and that you believe is high quality. Common sense, right? You’d be surprised by how many affiliate marketers forget that principle, but that’s a whole other story.
Did you ever see the movie Stripes? It's an 80's classic and one of those timeless comedies with Bill Murray. Click here to see Harold Ramis teaching his English class the Do Do Run Run by Shaun Cassidy. To get started teaching English as a second language to adults, go through your local schools and colleges to find classes where teachers of English are needed.
Upwork: This website offers a great marketplace for selling just about any professional service. You don't need a merchant account, website of your own or anything else for that matter. All you need to do is be able to provide a high-quality service at a reasonable price. But be informed, you will have to compete with many others that are constantly bidding on open jobs. 
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