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The DAGMAR model defines the four steps of an effective advertising campaign: awareness, understanding, persuasion and action. Dark cloud cover is a candlestick pattern that shows a downward shift in momentum after a price rise. Dark pools are private asset exchanges designed to provide additional liquidity and anonymity when trading large blocks of securities away from prying eyes. Darknet refers to encrypted online content that is not indexed by regular search engines. The Darvas Box Theory is a technical tool that allows traders to target stocks with increasing trading volume. Data mining is the process of analyzing large amounts of information to identify trends and patterns. Data smoothing uses an algorithm to remove noise from a data set, allowing you to highlight important patterns. The Universal Data Numbering System (DUNS) number is a unique nine-digit numeric identifier that is assigned to a single business entity. A data warehouse is a store of information over time by a business or other organization. David Ricardo was a classical economist who developed several key theories that still influence economics today.