Eighty-two percent of wealth generated last year across the world went to the richest one percent of the global population, while the 3.7 billion people who make up the poorest half saw their wealth flatline, according to a new Oxfam report published today as political and business elites gather in Davos for the World Economic Forum.

Reward Work, Not Wealth sets out how the very biggest gains were made by billionaires. Oxfam said it was unacceptable and unsustainable for economies to continue enabling a super-rich minority to accumulate vast wealth while hundreds of millions of people struggle to survive on poverty pay. The charity has called for a rethink of legal and business models that prioritise shareholder returns over broader social impact.

Oxfam has previously identified the role of tax dodging in driving inequality. This year, its report highlights how the excessive corporate influence on policy-making, erosion of workers' rights and relentless drive to minimise costs in order to maximise returns to investors all contribute to a widening gap between the super-rich and the rest.

Billionaire wealth rose by an average of 13 percent a year between 2006 and 2015 – six times faster than the wages of ordinary workers. It takes just four days for a CEO of one of the world's five biggest fashion retailers to earn as much as a Bangladeshi garment worker will earn in their entire lifetime.

Women consistently earn less than men and are concentrated in the lowest-paid, least-secure jobs. At current rates of change, it will take 217 years to close the global gap in pay and employment opportunities between women and men. Oxfam has heard from women in Vietnamese garment factories whose low wages force them to live apart from their children, women in the US poultry industry who wear nappies because they are denied toilet breaks, and women working in hotels in Canada and the Dominican Republic who stay silent about sexual harassment for fear of being fired.

Mark Goldring, Oxfam GB Chief Executive, said: "Something is very wrong with a global economy that allows the one percent to enjoy the lion's share of increases in wealth while the poorest half of humanity misses out. The concentration of extreme wealth at the top is not a sign of a thriving economy, but a symptom of a system that is failing the millions of hard-working people on poverty wages who make our clothes and grow our food.

"The world has made huge strides forward in ending poverty, but progress could be even faster if we did more to break down the barriers that are holding back the world's poorest people. For work to be a genuine route out of poverty, we need to ensure that ordinary workers receive a living wage and can insist on decent conditions, and that women are not discriminated against. If that means less for the already wealthy then that is a price that we – and they – should be willing to pay.

"Leaders should ensure that wealthy individuals and businesses pay their fair share of tax by cracking down on tax avoidance, and invest this into essential services like schools and hospitals, and creating jobs for young people."

Improved data has led to an upward revision of Oxfam's annual estimate of how many people own the same as the poorest half of humanity, although the trend of widening inequality remains. Now, 42 people own the same wealth as the poorest 50 percent. In its latest Global Wealth Report, Credit Suisse expanded its dataset. Using this new data, Oxfam now calculates that last year, 61 people owned the same as half the world. As recently as 2009, the figure was 380.

A new survey of 70,000 people in ten countries demonstrates huge support for action to tackle inequality. Nearly two-thirds of people say they want their government to urgently address the income gap between rich and poor in their country. In the UK, when asked what a typical British CEO earned in comparison to an unskilled worker, people guessed 33 times as much. When asked what the ideal ratio should be, they said 7:1. In some sectors the reality can be very different: FTSE 100 bosses, for example, earn on average 120 times more than the average employee.

"Many leaders say they are worried about the corrosive effect of inequality, but their tough talk too often fades away at the first resistance," Goldring added. "Some companies and wealthy individuals are taking steps towards fairer ways of doing business, but too many others use their power to protect their own interests. To really transform our economies, we need to look again at the business models and laws that prioritise shareholder returns above wider social benefit."

Tax avoidance by businesses and wealthy individuals is estimated to cost developing countries and poor regions $170 billion a year – money that could be used to fight poverty and provide public services. In the UK, Oxfam is urging the government to help fight tax dodging by using its upcoming Sanctions and Anti-Money Laundering Bill to ensure that Britain's overseas territories publish the owners of companies incorporated on their shores. The Paradise Papers revealed the key role that UK-linked tax havens such as Bermuda play in facilitating global tax avoidance.

Pay inequality in numbers:

• In 2017, it took just three days for the UK's top bosses to make more money than the typical UK full-time worker will earn all year, according to The High Pay Centre.

• In Nigeria, the legal minimum wage would need to be tripled to ensure decent living standards.

• Billionaires' fortunes grew by a staggering $762 billion in 2017 – enough to end extreme poverty more than seven times over.