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Comment by djb_hackernews

>This bot watches Donald Trump's tweets and waits for him to mention any publicly traded companies.

Ok, simple enough, go on.

> When he does, it uses sentiment analysis to determine whether his opinions are positive or negative toward those companies.

Eh, sentiment analysis isn't perfect but it has come a long way, plus Trump does typically say what he means in simplistic language.

> The bot then automatically executes trades on the relevant stocks according to the expected market reaction.

Ah market psychology. Stop. Do not pass Go. Do not collect $200. This is the tricky bit that a toy project will never get right and turns your slick algorithmic trading project into a monkey and a dart board.

Though this is a sweet example of an API mashup.

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