One thing i've often noticed but have never bothered to actively monitor is the real rate of inflation i face in the everyday items i purchase. This has been particularly noticeable living in HK where i'm sure lifestyle makes a big difference to the actual rate of inflation experienced, which is probably very different to the official rate.
I'm not particularly interested in logging day to day expenses or making note of prices, but i think it would be a useful exercise to look at a trend of monthly expenses over a few years, and to periodically categorise the types of expense. This will help to highlight any change in mix, and any areas of growth that i might not realise to be growing.
I'm not really looking to reduce spending at the stage, but would like to better understand what i spend and how this changes over time.