Borrowing could be a key element in this method. Say you borrow $200,000 and put in $50,000 of your own to buy a property for $250,000. Then you develop the property and sell it for $400,000. The property has increased in value by 60% but your $50,000 has now grown fourfold to $200,000. You have to select the right properties in the right areas and develop them wisely.

Selling blood….there are very few companies that buy your blood. #1 reason being MANY people willing to sell their blood are not the type of people you want to receive their blood, ie drug addicts (not everyone). And if you can find a company willing to buy your blood you can only give it every 56 days (for whole bood). The most common blood product that is bought is plasma and you can only do that every 28 days (in New York state …which won’t buy blood anyways).
Jeff have you ever considered adding something on price comparison sites for selling your used stuff? One of the fastest 100 bucks I have made so far was just from old textbooks and dvds on price comparison sites that give you the best offers. I know Bonavendi.com is a good but im sure there are others. Anyway would be interesting to see your take on the matter, the other ideas I found really creative though. Thanks for the read brother

Try Uber EATS or DoorDash. Uber EATS offers part-time work that’s similar to driving for Uber or Lyft. Instead of picking up passengers, however, you will pick up food orders and deliver them in your area. Pay works similarly, letting you earn a per-job rate plus tips. DoorDash works similarly, letting consumers order food from restaurants and connecting drivers to pick up and drop off their meals.
If you find yourself wanting something expensive in the quest for immediate gratification, divert yourself with a small indulgence rather than giving in to the large one. Walk away from the designer suit or purse, but buy an ice cream cone or catch a movie instead. The $8 movie ticket is a lot less expensive than the $800 purse but may give you the same feeling of doing something "just for you."

Track down your expenses. To soar your efficiency on cutting your expenses, it is vital to keep track of them. Pick one of the numerous expense tracking applications there are around, like Money Lover or Mint, and record every single penny that goes in and out of your wallet. After 3 months or so, you should be able to know where most of your money go and what can you do for that.
Some of the “gotcha” job offers from the past include check-cashing schemes, mystery shopping, medical billing “jobs” that require you to purchase expensive computer software, and craft-making jobs that ask you to pony up the cash for materials before you get started. And let’s not forget about the famous envelope-stuffing scam that was nothing more than a pyramid scheme designed to siphon money from as many people as possible.
The cash back industry is ruthlessly competitive, isn’t it!? All of 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.
Be professional. When you submit a résumé, don’t type it in ALL CAPS and please don’t avoid the caps lock like the plague. Know how to use it without looking incompetent. Write in complete sentences with proper grammar. Of course, there will be exceptions, but even with the exceptions, you must keep it professional. You’re building their view of you. 
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