This equation implies two things. First buying one more unit of good x implies buying {\displaystyle {\frac {P_{x}}{P_{y}}}} less units of good y. So, {\displaystyle {\frac {P_{x}}{P_{y}}}} is the relative price of a unit of x as to the number of units given up in y. Second, if the price of x falls for a fixed {\displaystyle Y} , then its relative price falls. The usual hypothesis is that the quantity demanded of x would increase at the lower price, the law of demand. The generalization to more than two goods consists of modelling y as a composite good.
​Self Publishing is mainstream today. When you purchase an eBook off of Amazon there’s a pretty good chance you’re buying a self-published book. Self-publishing is also ridiculously easy. I tried this a few years ago and couldn’t believe how simple the process was. To self-publish a book you’ll first need to write and edit it, create a cover, and then upload to a program such as Amazon’s Kindle Direct Publishing. Don’t expect instant success though. There will need to be a lot of upfront marketing before you can turn this into a passive income stream.
Real estate crowdsourcing allows you to surgically invest as little as $5,000 into a residential or commercial real estate project for potentially 8 – 15% annual returns based off historical data. Such returns are much better than the average private equity, CD, bond market, P2P lending, and dividend investing returns. With P2P lending, borrowers can sometimes default and leave you with nothing. At least with real estate crowdsource investing, there’s a physical asset that’s backing your investment. Multiple streams of Income covers this strategy. I highly recomend you read it if for that reason alone. Beats the typcial buy and hold (or is that buy and hope), dollar cost averaging and other so called sensible stategies which don't work unless you have a 20-30 year time horizon. Ask anyone who saw their investments plumet during the Jimmy Carter years back in the 70's how long they had to wait to get their investments back up to break even level. Want to take a guess? Would you believe 15 years? That is close. Are you sitting at home and wondering how you can bring a little bit more money into your home? Well, you can keep a steady stream of reliable income flowing in with multiple streams of income. It’s not hard to do, and just one idea can spark other income potential and generate multiple steams of income. Diversifying your income is a great way to be able to set a little bit aside for a rainy day.  My favorite type of semi-passive income was rental property because it was a tangible asset that provided reliable income. As I grew older, my interest in rental property waned because I no longer had the patience and time to deal with maintenance issues and tenants. Online real estate became more attractive, along with tax-free municipal-bond income once rates started to rise.  Note: This page contains one or more references to the Internal Revenue Code (IRC), Treasury Regulations, court cases, or other official tax guidance. References to these legal authorities are included for the convenience of those who would like to read the technical reference material. To access the applicable IRC sections, Treasury Regulations, or other official tax guidance, visit the Tax Code, Regulations, and Official Guidance page. To access any Tax Court case opinions issued after September 24, 1995, visit the Opinions Search page of the United States Tax Court. Retirees are paying a high price as the world stimulates its way out of the GFC (Great Recession). After a 30-year bull market to the lowest interest rates the world has ever seen, bonds have become highly priced and now don’t generate enough to meet income needs. Just 5 years ago the average income from$100,000 invested in a 10 year Australian Government Bond (10yrs) was $5,600 p.a. – now it’s less than half at$2,600 p.a.