Fools were out and about this week in an investing world jampacked with actions and ideas. Here are three articles you might find useful as you decide how to invest your money.

The Market Has Lost Its Mind With These Stocks
Looking at a stock's price is only a baby step in figuring out where to invest your money. "Any stock can be analyzed and painted as over- or undervalued when standing on its own, but sometimes a comparison analysis tells a better story," Fool contributor Travis Hoium wrote this week. "When a company is growing faster and more profitably than a competitor or industry rival, it should give us pause."

Travis put together three matchups to illustrate: Apple and Netflix (Nasdaq: NFLX), MGM Resorts and Melco Crown (Nasdaq: MPEL), and Intel (Nasdaq: INTC) and Advanced Micro Devices (NYSE: AMD). His analysis included looking at share prices, earnings per share, and revenue growth rates.

For the casino stocks, Travis gives the edge to Melco Crown because of its position in Macau. Check out the story to read the rundown on all three matchups.

The 5 Biggest Biases We Fall Victim To
Fool contributor Morgan Housel found some investing lessons in a talk given recently at TED by Bruce Schneier, an author who writes about how we perceive danger.

One of the lessons is that we underestimate risks in situations we do control and overestimate risks in situations we don't.

From Schneier: "Once you take up skydiving or smoking, you downplay the risks. If a risk is thrust upon you -- terrorism is a good example -- you overestimate the risk."

From Morgan: "In investing: How many out there are drowning in credit card debt and underwater on the mortgage, yet losing sleep over the U.S. Treasury borrowing money at 3% interest? Too many."

See the article to learn more about biases that may be negatively affecting your investing and financial decisions. Knowledge is power.

The Biggest ETFs You Don't Need
Amanda Kish, the Fool's resident fund advisor for the Fool's Rule Your Retirement investment newsletter service, was being a good stock scout this week. After taking a look at the 25 largest exchange-traded funds as measured by net assets, Amanda named three to avoid, a handful you shouldn't miss, and two to use with caution.

For the three that Amanda advises avoiding -- iShares MSCI Brazil Index (NYSE: EWZ), Energy Select Sector SPDR (NYSE: XLE), and iShares FTSE China 25 Index Fund (NYSE: FXI) -- it comes down to a lack of diversity in their holdings. Read the article for all of Amanda's analysis on these three, as well as ETFs she considers more worthy of your investment dollars.

See a stock in this story you'd like to follow? Add the ticker to your free, personalized My Watchlist, which will find all of our Foolish news and numbers on the stock.