Is it compulsory that the dca amount must be a fixed amount? If yes that means  investing can be burdensome and can make investors to use part of the money that they should have use to solve their expenses to completely their routing fixed amount of money for DCA at whenever their expenses becomes more larger than the previous week or month, for those that have a stable source of income probably a permanent job having a fixed amount for DCA can help to become more discipline in fact it can even become automated in a considerable way that it will not have a negative influence in sorting out their other needs, but for those that doesn't have a stable source of income maintaining a fixed amount for DCA will definitely become more difficult because of irregularities in their income flow, that is to say DCA amount shouldn't or must not be compulsorily a fixed amount for flexibility.