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  2. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A primary use of gray cards is to provide a standard reference object for exposure determination in photography. A gray card is an (approximate) realization of a Lambertian scatterer; its apparent brightness (and exposure determination) therefore depends only on its orientation relative to the light source.

  3. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

  4. List of countries by tax rates - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_tax_rates

    Map of the world showing national-level sales tax / VAT rates as of October 2019. Additional local taxes may apply. [citation needed]A comparison of tax rates by countries is difficult and somewhat subjective, as tax laws in most countries are extremely complex and the tax burden falls differently on different groups in each country and sub-national unit.

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