Two ways to enter the market
A lump sum means you invest the full amount on a single date. Monthly (or weekly) investing means you spread purchases over time - often called dollar-cost averaging (DCA), or pound-cost averaging in the UK when amounts are fixed in pounds.
AltPath can model both. The question is not which is always "better", but how timing and luck affected outcomes in the specific period you are studying.
When lump sums look stronger
In long rising markets, money invested early spends more time exposed to growth. A lump sum bought near the bottom of a cycle often shows a stronger result than dribbling in after prices have already risen.
That is hindsight. Without a crystal ball, many people did not have the confidence to deploy everything at once during scary headlines.
When regular investing helps psychologically
Spreading entries reduces the impact of one bad day. If you bought monthly through a volatile decade, your average entry price sits between the highs and lows.
For real-world behaviour, that can matter more than spreadsheet optimisation. A plan you actually stick to beats a perfect lump sum you never deploy because you waited for clarity.
Try both on AltPath
Run the same ticker and date range as a lump sum, then switch to a recurring schedule with the same total cash. Compare total return, drawdowns, and how it felt year by year in the chart.
Pair that with our portfolio builder if you are splitting money across several names rather than a single stock.
- Same total cash, different entry pattern.
- Note the worst interim dip, not just the final number.
- Check whether dividends materially changed the outcome.
