MacKenzie Scott is giving away her fortune at an unprecedented pace, donating more than $4 billion in four months after announcing $1.7 billion in gifts in July.

The world's 18th-richest person outlined the latest contributions in a blog post Tuesday, saying she asked her team to figure out how to give away her fortune faster. Scott's wealth has climbed $23.6 billion this year to $60.7 billion, according to the Bloomberg Billionaires Index, as Amazon.com Inc., the primary source of her fortune, has surged.

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