I don’t mean to be rude but “selling things on craigslist” shouldn’t be on the list, I mean that’s like saying to get rich you can just sell all the expensive stuff you have laying around from being rich already. Maybe steal a bunch of bbq’s and sell them on craigslist might apply. Also I don’t see how “my cousin has a job” is a vaild way to make 100 really quick in a day… I have a job too, is that some secret trick, getting a job? a good way to make 100 a day is selling plasma and sperm for girls eggs can get you several 1000. or just find some people that look like they have money and scam them.
To get started, create a listing by filling out a description, take and upload photos of your space, and set a price. Your listing helps guests get a sense of what your place is like. Then, set the dates the space will be available and draft your house rules. Once your listing is live, guests can book their stay at your home, and you start earning money.
A brand new way of selling t-shirts has arrived online, and sites like Teespring allow users to sell shirts that are of a great quality and don’t get created until there are enough buyers interested in the product, sort of like a shirt-on-demand business. Earnings for the campaigns can be discerned via the site’s data about the amount of shirts sold and the price per item.
People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer without having a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.

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).
If you have “extra” money sitting around or want to get serious about building wealth for later in life, consider investing it in the stock market with Ally Bank (whose investing branch is included on our list of best investment apps). If you don’t have immediate debts and aren’t currently living paycheck to paycheck, investing can be a powerful tool for generating passive returns.
The best part about this is that you don’t even have to ever touch the actual product, nor do you have to spend a dime on manufacturing these products. They do all the work for you. You just upload the design, choose the items you want your design to be on, and they’ll handle the rest (i.e. manufacturing, payment, shipping, and handling, returns…).
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