"The high demand, which we saw reflected on Auto Trader, also helped to fuel unprecedented double-digit price growth, and with it, very strong margins." Auto Trader said that 2021 had brought its largest ever annual marketing investment, culminating in the launch of a new campaign on Christmas Day highlighting the ease and simplicity of buying a car online. In its first two weeks the campaign – scheduled to run until April 2022 – reached 22% of all UK adults at least once through TV advertising and achieved over 24 million 'impacts' across TV and video on demand channels, Auto Trader said. This month's News Insight feature in the latest digital edition of AM magazine revealed that car retailers shared an uncertain outlook for 2022 as continued vehicle supply shortages look set to define the year ahead. The strength of used car values, and consumer demand, look set to stay, however.