Do you enjoy fast food or going into retail shops? Many companies hire mystery shoppers to test the customer service of their stores. A common one is Subway, which hires mystery shoppers to ensure that "Sandwich Artists" are following all the franchise guidelines. If you have time and can travel to different places, this could be a good side hustle.

Hunt for under-priced used books that you can sell online. Download an app that reads ISBN numbers so you can scan the barcodes on books. This will pull up the book’s current price on Amazon so you can see if it’s worth trying to resell it. Then, visit used book stores, thrift stores, and garage sales to look for high value books. Post the books for sale online using sites like Amazon or Ebay.[9]

Go undercover to local stores, look around, take notes and sneaky pictures of stuff doing nothing, fill in the questionnaire afterwards and get your cash. You can get mystery shopping assignments via Mobee app (typically the payments are not that big, yet the tasks you need to do are simple too) or get an account with Marketforce – a more established website where you’ll need to carefully fill in an application form and pass a review process. The potential earning are much bigger.
The audiobook industry is booming, yet only 5% of books ever get made into audio format. If you’ve got a background in acting, or if people have said you’ve got a voice made for the radio, you can make extra money recording audio versions of independent and popular books. Sites like ACX connect authors with audiobook performers. So, whether you’re an author looking for more ways to sell your book, or an actor/voice actor looking to make some extra income, you can sell your services online.
If you want to be a millionaire, it helps to know what you want, and then have the discipline to go after it. When you set a goal, you focus on it and pursue it. This means that you don’t get sidetracked by less important matters. If you know that you need to set $1,000 a month aside in order to meet your millionaire goal within an allotted timeframe, you focus on that. You cut expenses or, better yet, look for ways to increase your income, so that you can meet your goal. Sometimes it’s not fun, but millionaires usually stick with it.
I advocate for the Tim Ferris, multiple income stream strategy. It’s important to have a diversified portfolio and automatic income streams that supplement your basic income earned through work. Selecting the best investment and income streams requires a person do the research, but very basic strategies can be employed that grow the money nest. I think the article is right to say it’s better to earn rather than save more than you spend, because saving money can depend on very specific contexts, while earning money tends to be more predictive. Good article.
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