You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.
The doctor or lawyer, for instance, could use her or his income to invest in a medical start-up or buy shares of medical companies he understands such as Johnson & Johnson. Over time, the nature of compounding, dollar cost averaging, and reinvesting dividends can result in her or his portfolio generating substantial passive income. The downside is that it can take decades to achieve enough to truly improve your standard of living. However, it is still the surest path to wealth based on the historical performance of business ownership and stocks.
Wealth may be measured in nominal or real values – that is, in money value as of a given date or adjusted to net out price changes. The assets include those that are tangible (land and capital) and financial (money, bonds, etc.). Measurable wealth typically excludes intangible or nonmarketable assets such as human capital and social capital. In economics, 'wealth' corresponds to the accounting term 'net worth', but is measured differently. Accounting measures net worth in terms of the historical cost of assets while economics measures wealth in terms of current values. But analysis may adapt typical accounting conventions for economic purposes in social accounting (such as in national accounts). An example of the latter is generational accounting of social security systems to include the present value projected future outlays considered to be liabilities.[30] Macroeconomic questions include whether the issuance of government bonds affects investment and consumption through the wealth effect.[31]
The easiest and best way to shield your income from taxes is retirement plans. If your employer offers a 401(k) plan at work, put as much of your income into it as you can afford. At a minimum, invest up to the amount that will get you the maximum employer matching contribution. For example, if your employer offers a 50% match (3%) up to a 6% contribution by you, you should contribute at least 6% – and of course, more is always better.

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Geographic Arbitrage – As I mentioned in The Perfect Life article, I also plan on using geographical arbitrage to bring my FI date even closer. By living somewhere like Thailand for a portion of the year, the income from my United States investments and businesses will go much further than if I lived in the States. Renting will allow us to easily move to cheaper places, as needed or desired.