installment plan
The installment plan is when an item is bought over a set period of time by making payments in a lesser amount for the item. It became popular during the Great Depression when family incomes were insufficient to buy items outright.
Ad for the sale of a radio on the installment plan.http://www.google.com/imgres?num=10&hl=en&tbo=d&biw=1526&bih=710&tbm=isch&tbnid=9vQdmWZHgxgPMM:&imgrefurl=http://www.assumption.edu/users/McClymer/his261/ClassSched.html&docid=1lyF5-6rMnmOaM&imgurl=http://www1.assumption.edu/users/McClymer/his261/RadioAd.jpeg&w=728&h=796&ei=ulWxUOrWAofk9ATc-YDICA&zoom=1&iact=hc&vpx=904&vpy=151&dur=534&hovh=229&hovw=209&tx=70&ty=113&sig=101822436735864211341&sqi=2&page=1&tbnh=162&tbnw=148&start=0&ndsp=36&ved=1t:429,r:6,s:0,i:103