To model Viral Cycle Time’s effect on growth, I searched the web, high and low, looking for a pre-defined formula. To my great surprise, there was no formula that I could find that correctly calculated customer growth, and showed the impact of Viral Cycle Time. What was also surprising, was that I did find several blogs showing formulae for viral growth, but in every case, they appeared to make the same mistake, which was assuming that the entire customer base would continue sending out invitations for every cycle. So I collaborated with my partner, Stan Reiss, who turns out to be a whole lot smarter than I am, and he helped me develop the fomulae that are used in the more sophisticated model for viral growth below:
It’s easy to think as passive income as money earned while sitting on a beach sipping mojitos, but there is lots of work involved, says financial coach and retired hedge fund manager Todd Tresidder. If you’re worried about being able to save enough of your earnings to meet your retirement goals, building wealth through passive income is a strategy that might appeal to you.
Hi Sam! I loved your sentence, “There’s so much information in my head that I need to write it down or else I might explode.” That’s exactly how I feel! I never thought of myself as a writer, and especially not a blogger, but recently I’ve started dabbling in it and it feels so nice to get everything out! I’m dedicated to helping others succeed with personal finances, and there are plenty of “how-to” sites, but it’s important to get people thinking and motivated to prepare, plan, and save!
I wanted to specifically call out one particular strategy within equity investing that bears mentioning – dividend growth investing is when you focus on stocks that not only pay a dividend but have a history of strong dividend growth. When I was first building my portfolio of individual stocks, I focused on buying companies with a history of dividends, a history of strong growth, and financials that supported a continuation of both.

The Internet makes it possible for a campaign to go viral very fast; it can, so to speak, make a brand famous overnight. However, the Internet and social media technologies themselves do not make a brand viral; they just enable people to share content to other people faster. Therefore, it is generally agreed that a campaign must typically follow a certain set of guidelines in order to potentially be successful:
As for me, I started focusing on passive income last year, but have owned rentals for 5 years. $25k now outside retirement accounts in mostly real estate. Looking to invest another $500k cash into real estate to get about $65k, and then 1031 under performers next year to hopefully boost that a bit higher. Heavy in real estate, but feels lower risk than the stock market to me if you have cashflowing properties. Real estate is inflation adjusted, and built in cashflow raise when the loan pays off.
When you invest in a dividend-paying stock, you are buying a share of the company and you literally become part-owner of that business. As the company grows and generates extra cash that it doesn’t necessarily want to re-invest, it might decide to return some of the extra cash to the shareholders in the form of dividends. And because you own a fraction of the company, you will receive a portion of the cash!
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.
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]
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