Economic turmoil associated with the coronavirus pandemic has wide-ranging and severe impacts upon financial markets, including stock, bond and commodity (including crude oil and gold) markets. Major events included the Russia–Saudi Arabia oil price war that resulted in a collapse of crude oil prices and a stock market crash in March 2020. The United Nations Development Programme expects a US$220 billion reduction in revenue in developing countries, and expects COVID-19's economic impact to last for months or even years.[40][2] Some expect natural gas prices to fall.[41]