Over the next ten years, as his press empire grew, Murdoch established a hugely lucrative financial base, and these profits were routinely used to subsidise further acquisitions. In his early years of newspaper ownership Murdoch was an aggressive, micromanaging entrepreneur. His standard tactic was to buy loss-making Australian newspapers and turn them around by introducing radical management and editorial changes and fighting no-holds-barred circulation wars with his competitors. By the 1970s, this power base was so strong that Murdoch was able to acquire leading newspapers and magazines in both London and New York, as well as many other media holdings.