implementation of risk managed momentum strategy
The paragraph before on page 115 states: Scaling corresponds to having a weight in the long and   short legs that is different from one and varies over time,   but the strategy is still self-financing. Meaning that the long and short positions are no longer equal due to weighting one side more highly than the other. The weighting of one side (either long or short) is the number between 0.2 and 2 that you mention.
A lot of these firms consist of ex-McKinsey consulting people that know how to evaluate operations, efficiency, etc.  Like any company, operating plans are presented by mgmt to the board and implemented by management.  The PE firm works with management to design the operating strategy, and that may be done in-house (PE firm) and/or with outside consults in the industry.  Operational performance is important, but unfortunately a lot of PE firms really only engage in financial engineering.  The more industry/sector specific the PE the firm, the more value they likely add (as a generalization). "Wouldn't this be part of your investing strategy to know what price is considered a ""good"" price for the stock?  If you are going to invest in company ABC, shouldn't you have some idea of whether the stock price of $30, $60, or $100 is the bargain price you want?  I'd consider this part of the due diligence if you are picking individual stocks.  Mutual funds can be a bit different in automatically doing fractional shares and not quite as easy to analyze as a company's financials in a sense. I'm more concerned with the fact that you don't seem to have a good idea of what the price is that you are willing to buy the stock so that you take advantage of the volatility of the market. ETFs would be similar to mutual funds in some ways though I'd probably consider the question that may be worth considering here is how much do you want to optimize the price you pay versus adding $x to your position each time.  I'd probably consider estimating a ballpark and then setting the limit price somewhere within that.  I wouldn't necessarily set it to the maximum price you'd be willing to pay unless you are trying to ride a ""hot"" ETF using some kind of momentum strategy.  The downside of a momentum strategy is that it can take a while to work out the kinks and I don't use one though I do remember a columnist from MSN Money that did that kind of trading regularly." "Currency, like gold and other commodities, isn't really much of an investment at all. It doesn't actually generate any return. Its value might fluctuate at a different rate than that of the US dollar or Euro, but that's about it. It might have a place as a very small slice of a basket of global currencies, but most US / European households don't actually need that sort of basket; it's really more of a risk-management strategy than an investment strategy and it doesn't really reflect the risks faced by an ordinary family in the US (or Europe or similar). Investments shouldn't generally be particularly ""exciting"". Generally, ""exciting"" opportunities mean that you're speculating on the market, not really investing in it. If you have a few thousand dollars you don't need and don't mind losing, you can make some good money speculating some of the time, but you can also just lose it all too. (Maybe there's a little room for excitement if you find amazing deals on ordinary investments at the very bottom of a stock market crash when decent, solid companies are on sale much cheaper than they ordinarily are.)" This strategy is called trading the 'Golden Cross' if the 50 day SMA moves above the 200 day, or the 'Death Cross' when the 50 day SMA moves below the 200 day SMA. Long-term indicators carry more weight than shorter-term indicators, and this cross, in a positive direction signals a change in momentum of the stock. You will not catch the very bottom using this method, but there is a better chance that you will catch a move near the beginning of a longer-term trend. Golden Cross Information - Zacks "There are some good answers about the benefits of diversification, but I'm going to go into what is going on mathematically with what you are attempting. I was always under the assumption that as long as two securities are less than perfectly correlated (i.e. 1), that the standard deviation/risk would be less than if I had put 100% into either of the securities. While there does exist a minimum variance portfolio that is a combination of the two with lower vol than 100% of either individually, this portfolio is not necessarily the portfolio with highest utility under your metric.  Your metric includes returns not just volatility/variance so the different returns bias the result away from the min-vol portfolio. Using the utility function: E[x] - .5*A*sig^2 results in the highest utility of 100% VTSAX. So here the Sharpe ratio (risk adjusted return) of the U.S. portfolio is so much higher than the international portfolio over the period tracked that the loss of returns from adding more international stocks outweigh the lower risk that you would get from both just adding the lower vol international stocks and the diversification effects from having a correlation less than one. The key point in the above is ""over the period tracked"".  When you do this type of analysis you implicitly assume that the returns/risk observed in the past will be similar to the returns/risk in the future.   Certainly, if you had invested 100% in the U.S. recently you would have done better than investing in a mix of US/Intl.  However, while the risk and correlations of assets can be (somewhat) stable over time relative returns can vary wildly! This uncertainty of future returns is why most people use a diversified portfolio of assets.  What is the exact right amount is a very hard question though." Support and resistance only works as a self-fulfilling prophecy. If everyone trading that stock agrees there's a resistance at so-and-so level, and it is on such-and-such scale, then they will trade accordingly and there will really be a support or resistance. So while you can identify them at any time scale (although as a rule the time scale on which you observed them should be similar to the time scale on which you intend to use them), it's no matter unless that's what all the other traders are thinking as well. Especially if there are multiple possible S/P levels for different time scales, there will be no consensus, and the whole system will break down as one cohort ruins the other group's S/P by not playing along and vice versa. But often fundamentals are expected to dominate in the long run, so if you are thinking of trades longer than a year, support and resistance will likely become meaningless regardless. It's not like that many people can hold the same idea for that long anyhow. "I recommend you take a look at this lecture (really, the whole series is enlightening), from Swenson. He identifies 3 sources of returns: diversification, timing and selection. He appears to discard timing and selection as impossible. A student kinda calls him out on this. Diversification reduces risk, not increase returns. It turns out they did time the market, by shorting .com's before the bubble, and real estate just before the downturn. In 1990, Yale started a ""Absolute Return"" unit and allocated like 15 percent to it, mostly by selling US equities, that specializes in these sorts of hedging moves. As for why you might employ managers for specific areas, consider that the expense ratio Wall Street charges you or me still represent a very nice salary when applied to the billions in Yale's portfolio. So they hire internally to reduce expenses, and I'm sure they're kept busy. They also need people to sell off assets to maintain ratios, and figuring out which ones to sell might take specialized knowledge. Finally, in some areas, you functionally cannot invest without management. For example, Yale has a substantial allocation in private equity, and by definition that doesn't trade on the open market. The other thing you should consider is that for all its diversification, Yale lost 25 percent of their portfolio in 2009. For a technique that's supposed to reduce volatility, they seem to have a large range of returns over the past five years." How much money do you have in your money market fund and what in your mind is the purpose of this money? If it is your six-months-of-living-expenses emergency fund, then you  might want to consider bank CDs in addition to bond funds as an alternative to  your money-market fund investment. Most (though not necessarily all, so be sure to check) bank CDs can be cashed in at any time with a penalty of three months of interest, and so unless you anticipate being laid off very soon, you might get a slightly better rate of interest, FDIC insurance (which mutual funds do not have), and with any luck you may never have to break a CD and lose the interest. Building a ladder of CDs with one maturing each month might be another way to reduce the risk of loss.  On the other hand, bond mutual funds are a risky bet now because your investment will lose value if interest rate go up, and as JohnFx points out, interest rates have nowhere to go but up.  Finally, the amount of the investment is something that you might want to consider before making changes. If you have $50K put away as your six-month fund, you are talking of $500 versus $350 per annum in changing to a riskier investment with a 1% yield from a safer investment with a 0.7% yield. Whether bragging rights at neighborhood parties are worth the trouble is something for you to decide.