What is Lump sum investing?
Lump sum investing means putting an amount of money you already have into the market all at once, rather than spreading it out over months. It gives the whole amount the most time invested, which has tended to help when markets rise. It also means the whole amount takes the hit if prices fall soon after.
Why Lump sum investing matters
It is the comparison point for dollar-cost averaging whenever someone has a windfall to invest.