Argo star Ben Affleck is putting his money where his mouth is in a poverty-awareness campaign, Fox News reports.

The wealthy Oscar winner is vowing to accept a challenge next week: He will try to live on $1.50 a day.

Affleck’s efforts are part of the charity Live Below the Line. For at least one day, Affleck and other stars including Sophia Bush, Josh Groban, Debi Mazar and Hunter Biden will try to keep their food and drink costs below $1.50.

Live Below the Line said the purpose is “to give a glimpse into the lives of 1.4 billion people who have no choice but to live below the line every day — and who have to make $1.50 cover a lot more than food.”

Participants will update followers on their Twitter accounts.