You already have an answer to the question you asked from what you have written. If we were to look at from economical aspect the DCA is still preferred than doing lump suming. The idea of lump sum is to be used whenever you have some spare cash available, that is off no use , that is your bills,and other savings are already sorted. But the funds used for lump suming might not be available everytime and it's not everyone have spare funds available.
At times they might quickly use it settle somethings. With DCA you can keep investing into bitcoin with your discretionary income (whether little or big), and in a consistent manner regardless of the price . The only time I feel lump sum can be more economical is if you luckily buy the dip and bitcoin prices retraces upward. I am not suggesting someone should wait for the dip,
but if you already have your DCA ongoing and the price of bitcoin happen to dip, then using some spare cash for lump sum can be a good move. . JJG explained to me perfectly here:
https://bitcointalk.org/index.php?topic=5376945.msg67170941#msg67170941Lump sum is different thing from buying dip. AFAIK, when you put your money once into bitcoin when the price dip down low, then that is still buying the dip and not lump sum. Lump sum has no business with whether the price is up or it is flat down. It is done with they extra cash without person even checking the price of bitcoin. Another thing about lump sum is that you don't have to have plenty cash sitting around before you can lump sum.
Guys don't need to be having$5000 or even $500 before they can lump sum. Just with that your $100 you have and you could also lump sum. I prefer spreading my risk so I will still choose dca above all of them.
Lump sum is a one-time investment. And buying the dip is a decision to buy at that time, taking into account the fact that the price of the asset is falling. So if someone invests the entire $ 100 he has at once and the price of Bitcoin is falling at that time, then it can be both a lump-sum investment and buying the dip at the same time.
It is not mandatory to have a huge amount of money to make a lump sum. If someone has just $ 100 extra money to invest and he invests it all at once, then that is also a lump-sum investment for him. There is no need for a specific amount of $ 500, $ 5,000 or more. It is more important to understand the difference between these three, rather than seeing them as alternatives to each other. Whether you invest your money all at once, wait for the price to fall, or invest in regular installments depends on planning, risk-taking ability and mental comfort.