The Australian sharemarket fell sharply on Friday as a 5.6 per cent plunge in BHP shares weighed heavily on the ASX 200, offsetting gains from CSL, energy stocks and the major supermarkets. BHP's decline followed a cost blowout at its Canadian potash project, although the mining giant's shares remain up around 70 per cent over the past year. SBS Finance Editor Ricardo Gonçalves speaks with Andrew Wielandt, Partner at DP Wealth Advisory, about the day's market moves and what's driving investor sentiment.