Gallery. 1  Hand-cranked planetary sharpener, with cover in place. 2  Hand-cranked planetary sharpener from 1950â60, with cover removed. 3  Hand-cranked planetary sharpener with spring-driven pencil holder. 4  AC-powered electric pencil sharpener. 5  Battery-operated sharpener.
Description. Tracking Error is a measure of how closely an ETF follows its benchmark index. This data point seeks to isolate the ability of the portfolio managers to track the index, ignoring the confounding effects of ETF liquidity on market prices.escription. Tracking Error is a measure of how closely an ETF follows its benchmark index. This data point seeks to isolate the ability of the portfolio managers to track the index, ignoring the confounding effects of ETF liquidity on market prices.
It was State Street Global Advisors that launched the first exchange-traded fund (ETF) in 1993 with the introduction of the SPDR. Since then, ETFs have continued to grow in popularity and gather assets at a rapid pace. The easiest way to understand ETFs is to think of them as mutual funds that trade like stocks. This trading characteristic is one of the many features that have made ETFs so attractive, particularly to professional investors and individual active traders. (For a background on what ETFs are and how they work, check out Introduction to Exchange-Traded Funds.) The Benefits of Trading Like a Stock.