Is it better to buy lump sum or dollar cost average when building up a position?
Understandably it depends on the situation. For example if there's a particularly severe crash, it might pay better to throw in the lot rather than average out.
Conversely it may be better to average out when building a position that, for example, is on a down trend and you're speculating is meeting resistance sometime soon, but may still have further to fall.
Also might dollar cost averaging reduce returns because you might "miss the boat" when an issue rises?