To answer your question, 5X more productive than commonly used programming languages like C++, Java, C#, JavaScript, and Python. There is plenty of anecdotal evidence to support this.

However, I realize that many people don’t trust anecdotal evidence, so here is a statistical study that bolsters the claim: https://www.ifpug.org/wp-content/uploads/2017/04/IYSM.-Thirty-years-of-IFPUG.-Software-Economics-and-Function-Point-Metrics-Capers-Jones.pdf. Apparently, Smalltalk is, on average, twice as productive as the abovementioned languages.

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