Australian Market Performance: VAS.AU's price reflects the overall health of the Australian stock market. Broad market rallies drive it up; downturns pull it down.

Underlying Stock Performance: VAS.AU's price is directly tied to the performance of the top 300 ASX-listed companies it holds. Strong results from these firms boost the ETF.

Investor Demand: High investor demand for VAS.AU increases its price, while selling pressure decreases it. Supply and demand dynamics constantly influence the ETF's value.

Dividend Payments: Dividend payouts from the underlying companies in VAS.AU can slightly impact its price, generally leading to a small decrease on the ex-dividend date.

Management Fees & Expenses: The small management fees and operating expenses charged by Vanguard can have a marginal effect on the ETF's returns and price over time.

Global Economic Factors: Global economic conditions, such as interest rate changes and international trade, can indirectly influence the performance of Australian companies and subsequently VAS.AU.