Under the assumption "EKG.US ETFs" refers to an ETF tracking the Global X Aging Population ETF, the price is affected by several factors:

Underlying Holdings Performance: The price reflects the combined performance of stocks within the aging population theme, like healthcare and senior housing.

Supply and Demand: High demand drives the price up, while increased selling pressure pushes it down.

Expense Ratio: The ETF's management fee can slightly reduce overall returns and thus influence price.

Net Asset Value (NAV): The NAV, representing the total value of underlying assets divided by shares outstanding, is a crucial benchmark; price deviations from NAV may indicate trading inefficiencies.

Broader Market Trends: General market sentiment (bullish or bearish) and economic conditions influence investor confidence and impact the ETF's price.

Currency Fluctuations: If the ETF holds international stocks, currency exchange rates can affect returns and the ETF price.

Sector Performance: The performance of sectors represented within the aging population theme (e.g., healthcare, pharmaceuticals) impacts the ETF's value.

Index Tracking Accuracy: How closely the ETF mirrors its underlying index (if applicable) influences its performance and price.

Investor Sentiment towards Demographics: Perceptions about the aging population as an investment theme affect demand and therefore the ETF's price.