App development business Appster, created by Young Rich Listers Mark McDonald and Josiah Humphrey, has collapsed, with the co-founders placing operations globally into liquidation.
The young tech gurus have been ranked as some of the country's richest people under 40, making their debut on the list with a combined wealth of $58 million in 2015 and featuring on the list every year since. This year they were ranked at 96th and 97th and had a combined wealth of $52 million.
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