What happens if you have attrition in your customer base over time. An easy way to extend the model to take this into consideration would be to add a variable to model Attrition Rate as a percentage of the entire installed base at each cycle, and simply subract this from the total population at each cycle. This topic is nicely covered in this blog post by Andrew Chen: Is your website a leaky bucket? 4 scenarios for user retention.

What I did:The first two years of work in NYC was brutal. I told myself there was no way I could work on Wall St for my entire career because I’d probably die from heart failure by age 40. Having an early death in my mind willed me to save 50%+ from the first year onward and devise a CD, real estate, and stock investment distribution system for my savings every year. I thought about starting this site for at least a year before I hired someone from Craigslist to give set me up and push me forward. Hiring someone to get started is totally worth it if you are a master procrastinator. You can now learn how to start your own site with my step-by-step guide to save yourself time and money. 

Writing an e-book is very popular among bloggers, as many have noted that “it's just a bunch of blog posts put together!” You will not only have to make an investment of time and energy to create the e-book, but market it correctly. However, if marketed correctly (through blogging affiliates in your niche, for example), you could have residual sales that last a very long time.
What I’m doing: My realistic goal is to have a blended annual return of 2x the risk free rate. With a current 5% hurdle, I am not paying down mortgages that cost less than 4%. Debt at 5% is a wash. My realistic blue sky scenario is a 3-4X rate of return over the risk free rate which can be achieved with property, stocks so far for the past five years, and certain private equity investments. Where I am dragging is my blended average CD interest rate of roughly 3% from an old CD coming due. I’ve rolled some money into a 12-month CD with CIT Bank at 2.5%. It’s the best rate I can find. 
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In mid 2016, an Indian tea company (TE-A-ME) has delivered 6,000 tea bags[79] to Donald Trump and launched a video on YouTube.[80] and Facebook[81] The video campaign received various awards including most creative PR stunt[82] in Southeast Asia after receiving 52000+ video shares, 3.1M video view in first 72-hour and hundreds of publication mentions (including Mashable, Quartz,[83] Indian Express,[84] Buzzfeed[85]) across 80+ countries.
One great way to generate a passive income is through affiliate marketing. Now, this does depend on the size of your list. Yes, size matters when it comes to your list. Especially if you're looking to make some serious money and do it on autopilot. But, list-building takes time. It doesn't happen overnight. And you need to add value to your list or you become obsolete.
Basically, people looking to borrow money will make a listing on the site. Those borrowers are then placed into a category and given a “rating” based on their credit history and rate. You, as an investor, will contribute money to these loans and then be paid back at the predetermined rate of interest. Invest and see those monthly interest payments deposited into your account.
There are three main categories of income: active income, passive income and portfolio income. Passive income has been a relatively loosely used term in recent years. Colloquially, it’s been used to define money being earned regularly with little or no effort on the part of the person receiving it. Popular types of passive income include real estate, peer-to-peer (P2P) lending and dividend stocks. Proponents of earning passive income tend to be boosters of a work-from-home and be-your-own-boss professional lifestyle. The type of earnings people usually associate with this are gains on stocks, interest, retirement pay, lottery winnings, online work and capital gains. 
Some things aren’t funny: A 2013 UK ad for Hyundai used a failed suicide as a punchline (oh, haha, this guy wants to use his car’s emissions to kill himself, but the car is too efficient). A negative reaction ensued, including an open letter from a blogger who posted the suicide note of her father, who killed himself in the same manner attempted in the ad. (6)

Viral marketing works famously on the Internet because instant communication is easy and inexpensive. The digital format makes copying simple. From a marketing standpoint, you must simplify your marketing message so it can be transmitted easily and without degradation. Short is better. The classic is: “Get your private, free email at http://www.hotmail.com.” The message is compelling, compressed, and copied at the bottom of every free email message.
Decision-making process seems to be hard for customers these days. Millers (1956) argued that people suffered from short-term memory.[57] This links to difficulties in customers' decision-making process and Paradox of Choice,[58] as they face various adverts and newspapers daily.[59] Influencers serve as a credible source for customers' decision-making process.[49][41] Neilsen reported that 80% of consumers appreciated a recommendation of their acquaintances,[60] as they have reasons to trust in their friends delivering the messages without benefits[60] and helping them reduce perceived risks behind choices.[61][62]
We have 1 rental at the moment and we are renovating the second one. Last year we generated over $14,000 net passive income (after mortgage payments and taxes) from one apartment, and all I had to do was go in to inspect the property 3 times to make sure the tenants weren’t destroying it! It turned out they kept it in perfect condition and they were lovely people! Call me lucky.
One of the easiest ways to increase your passive income is to shift your savings to a bank that pays a higher yield on your savings — for example, Discover Bank and EverBank pay almost 1% for your money. Although it doesn’t sound like much (especially in this low interest environment), little things do add up and eventually interest rates will rise.
I have six rental units which are a good source of passive income. I don’t use a property manager because you are right…they take about 10% of your rent. There are really only 2 things that tenants call about: 1. A plumbing issue 2. Heat/Air problems. Just find a plumber and heat/air guy you can trust. I travel a lot for my primary job. When a call comes in from a tenant, I can call the repair guy in just as easy as a property manager.

What does a virus have to do with marketing? Viral marketing describes any strategy that encourages individuals to pass on a marketing message to others, creating the potential for exponential growth in the message’s exposure and influence. Like viruses, such strategies take advantage of rapid multiplication to explode the message to thousands, to millions.
This is where my previous mention of “America’s Funniest Home Videos” becomes relevant. A large number of successful viral marketing campaigns involve real people reacting to imagined situations. Think about TNT’s ‘Drama Button’ campaign. It brought the drama of an intense show onto the streets of Belgium, shocking the real people on the streets. People loved it because they could see themselves in those reactions.
Very enlightening. I like that you have a number of discreet passive income streams working for you. I”m not sure about such a large CD/ bank holding though, though it looks as though its giving you a fairly healthy income. How do you feel about a rising inflation rate on your effective real cash return? I’m looking to diversify beyond my current dividend passive income. Rental income is what I expect we’ll be harvesting next. P2P lending is a little too out of my comfort zone. I had a lot of exposure to consumer credit risk models at a prior role, and it scared me the heck away from consumer lending!
If you have a blog or some other property that has visitors, you might profit passively via affiliate advertising. For example, imagine that you write a blog about movies. You might review some books about movies, and then link to them on Amazon so you get a cut of the purchase price when anyone buys books through the links. If you blog about hiking, you might promote some hiking gear you recommend on the blog, again generating passive income if anyone buys any of it.
Depending on the product(s) you sell, you may have to get more specific to find the most viral content most appealing to your target customer base. The fastest way to do some topic-specific viral content research is using hashtags or keyword searches on each respective network. Instagram, for example, will give you the top posts for the specific Instagram hashtags, followed by the most recent posts.YouTube orders keyword search results by relevance, then by popularity. Verified YouTube channels will typically lead the pack if they have any applicable videos.Twitter sorts keyword and hashtag search results by relevance and popularity, with posts from verified Twitter users leading the pack.These searches and similar on other top networks will show you what people see on each network when they search for keywords or hashtags related to the products your business sells. If you can create viral content for those networks, you stand a good chance at coming up in searches made by your target customers. As you analyze the trending content, be sure to note specific details, such as the following.
5. Make sure you are properly diversified. Capital preservation is underrated. We saw a lost decade for tech stocks between 2000 and 2010 after the first dot-com bubble burst. It actually took 13 years for Nasdaq investors to get back to even. Investors in the Borsa Istanbul stock market index just gave up 10 years' worth of gains after they saw a plunge in their currency, partially due to increased tariffs by the US and a lack of confidence in the government. Your passive income needs to be properly diversified in order to take the hits.
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.
The ultimate goal of marketers interested in creating successful viral marketing programs is to create viral messages that appeal to individuals with high social networking potential (SNP) and that have a high probability of being presented and spread by these individuals and their competitors in their communications with others in a short period of time.[9]