Formatting financial statements in commn size can eliminate inherent bias' that usually occurs whenever analyzing companies of differing sizes. Common size also allows for the analysis of a company over various time periods rapidly, e.g. revealing what percentage of sales is cost of goods sold and how that value has changed over time.
State Street SPDR S&P 500 ETF Trust, www.ssga.com/sg/en/institutional/capabilities/equities/spdr-core-equit, SIC Code: 6722, MANAGEMENT INVESTMENT OFFICES, OPEN-END
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