materials has increased more than 20%. metal products 26%, lumber 721.8% and plastic 35.2%. plywood it used to be like 20, $25. now you pay almost $50. reporter: these price hikes are impacting new construction and existing homes. if the cost of producing housing goes up, in order for that housing production to be possible, you need to charge higher rent or else you re going to lose money, and that s an important source of where our inflation efforts are coming from. reporter: richard green, an economist and expert on housing markets believes house prices will fall next year and thinks rent will continue to increase but not as rapidly. and in terms of materials jgeopolitical issues have an enormous impact on supply chain