The aggressive and rapid expansion of German discount giant Aldi in the Australian market is causing other retailers more problems than straightforward increased competition; there is now a shortage of available sites for new stores and rents are going through the roof. Aldi, which entered Australia in January 2001, now operates 40 stores that are mainly situated in New South Wales. This portfolio will be increased by a further 14 stores in the next few months, two of which will be in metropolitan sites.