evidence: Ireland's two richest billionaires have more combined wealth than the bottom half of the population in the country, according to figures released by the charity Oxfam. Oxfam’s annual Inequality Report, which derives its calculations from the Forbes rich list, found that the richest 1% of people in Ireland hold 35.4% of the country’s financial wealth. A progressive wealth tax on Irish millionaires and billionaires could generate up to €9.2 billion a year, the charity says.