Could you please clarify for me, is it really feasible to purchase an Exchange Traded Fund, or ETF, with the sum of merely one dollar? Given that ETFs often require larger sums of investment due to transaction fees and the minimum share purchases typically set by brokerages, I'm curious as to whether this small amount would be sufficient. Could you elaborate on the practicality of this idea, considering the costs involved and any potential limitations? Would there be any specific ETFs that might allow for such a small investment, or is this generally not a viable option? Thank you for your insights.