Major economies grappling with housing crises will struggle to crank up the supply of affordable homes in coming years, according to a Reuters poll of property analysts who said more government intervention was needed to improve the situation. House prices in most major property markets were forecast to rise over 4% this year thanks to supply lags and expectations that top central banks will cut rates soon. An acute lack of starter homes, a perennial problem made worse during the COVID-19 pandemic, was not likely to be addressed anytime soon, according to experts polled May 9-30 across markets in the U.S., Canada, Britain, Germany, India, Australia and New Zealand.