Jack Dorsey is devoting $1 billion of his stake in Square Inc., the payments firm he co-founded, to help fund coronavirus relief efforts.

“After we disarm this pandemic, the focus will shift to girl’s health and education, and UBI,” Dorsey said Tuesday in a tweet, referring to universal basic income. The pledge represents about 28% of his wealth.

At the end of his Twitter thread, Jack said: “Why now? The needs are increasingly urgent, and I want to see the impact in my lifetime. I hope this inspires others to do something similar. Life is too short, so let’s do everything we can today to help people now. ✌?”

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Dorsey, also co-founder of Twitter Inc., has a net worth of about $3.9 billion, according to the Bloomberg Billionaires Index.

Meanwhile, Malala thanked Jack for his generosity.