I think researches on trading systems is the main issue of building trading strategies. Our main goal is to build a strategy, which will be successful in the future and not only on backtests (curve-fitting). Thatis why I consider it right to start the topic with the description of the two approaches to the creation of trading strategies.
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Momentum is one of the simplest and most popular indicators among traders. As its creator, certain sources name a French mathematician Paul Émile Appell. This indicator helps define the trend direction and the speed of the price change.