Underlying Index Performance: BBFD.AU aims to track an index. The price is heavily influenced by the performance of the index it replicates. If the index constituents rise, BBFD.AU's price will generally increase.

Supply and Demand: Like any security, BBFD.AU's price is subject to supply and demand forces in the market. Higher demand pushes the price up, while increased supply can lower it.

Currency Fluctuations: As BBFD.AU invests in international assets, currency fluctuations between the Australian dollar and other currencies impact the ETF's price. A weaker AUD boosts returns, while a stronger AUD reduces them.

Fund Management Fees: While not directly affecting daily price swings, the expense ratio charged by the ETF manager reduces the overall return to investors over time. Higher fees translate to slightly lower returns compared to the tracked index.

Market Sentiment: Overall investor sentiment towards the asset classes represented in BBFD.AU and towards ETFs in general, can affect trading activity and therefore the price.

Rebalancing and Index Changes: Changes to the underlying index composition can lead to adjustments in the ETF's holdings, causing temporary price fluctuations as the fund buys or sells assets to align with the new index.