Yes, you can buy at an all-time high
One of the oddities about reporting on equities and financial markets is the mainstream media’s obsession with daily price movements and new record price levels. Websites are always harping on about the top 10 daily gainers or losers, and editors cannot resist breaking out the champagne every time an index hits a new high. It seems silly in the context that an index of shares has to continually reach new highs to deliver on the asset class’ risk-return promise.