Etsy now allows you to sell digital products in your store. This can be anything from a picture that someone can download and frame to a guide on how to create a budget in PDF form. The possibilities for you to be creative are endless. The nice thing is, once you create a digital product for Etsy, you upload it and you can sit back and watch the sales come in (assuming your digital product is awesome).

I like the way you have listed the ways to earn extra income and was quite surprise that you did not make mention of network marketing, which is a way to make extra income without quitting your regular, though most people view mlm as a pyramid scheme but the real pyramid scheme is a regular 9 to 5, because you can only have one president of a company at any given time and network marketing business model to promote product that can be used is really cheap to join and can offer a substantial extra income or what do you think?
Takes advantage of other resources. The most creative viral marketing plans use other resources to get the word out. Affiliate programs, for example, place text or graphic links on other websites. Authors who give away free articles, seek to position their articles on other web pages. A news release can be picked up by hundreds of periodicals and form the basis of articles seen by hundreds of thousands of readers. Now someone else’s newsprint or web page is relaying your marketing message. Someone else’s resources are depleted rather than your own.

Inspired by you, I started a tax/personal finance a month ago. I figured if it works out, it will create a good side income for me. If not, at least I can use the blog to build my brand as a tax lawyer. Other than that, my current investment portfolio is heavily focused on index funds because of its historical performance and tax & cost efficiency. Right now my dividends income every year is about $14,000. I also have a good amount of unrealized capital gains every year from my investment, though I don’t count the capital gains as my passive income as they are paper gains, at least for now.
With $200,000 a year in passive income, I would have enough income to provide for a family of up to four in San Francisco, given we bought a modest home in 2014. Now that we have a son, I'm happy to say that $200,000 indeed does seem like enough, especially if we can win the public-school lottery to avoid paying $20,000 to $50,000 a year in private-school tuition.
Working with people outside of your usual industry can help you create a buzz for both of your companies. The TV show The Walking Dead teamed up with UC Irvine to create an open online course on what a zombie apocalypse would be like. Zombie lovers ate it up like free brains. Both the show and the university benefitted. HP teamed up with Kiva to allow HP employees an extra $25 to donate to the Kiva project of their choice. Both HP and Kiva gained exposure, while worthy charitable causes received funding.
If you’re a YouTube personality, this is how you generate your income. An amazing example of this how Antonio Centeno got 1 million YouTube subscribers. If you’re a blogger who gets a lot of traffic to your site and uses advertising or sponsorships, then you’re also following the AA Model. Got a podcast with sponsorships? Same deal. I talk about successful podcast sponsorships and other ways to make money podcasting here:
The term viral strategy was first used in marketing in 1995, in a pre-digital marketing era, by a strategy team at Chiat/Day advertising in LA (now TBWA LA) for the launch of the first PlayStation for Sony Computer Entertainment. Born from a need to combat huge target cynicism the insight was that people reject things pushed at them but seek out things that elude them. Chiat/Day created a 'stealth' campaign to go after influencers/opinion leaders, using street teams for the first time in brand marketing and layered an intricate omni-channel web of info and intrigue. Insiders picked up on it and spread the word. Within 6 months PlayStation was number one in its category—Sony's most successful launch in history.
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