Connected to this: A preemptive favor is more likely to result in later requests (even if larger than the initial favor) being fulfilled, but the end result may or may not be a more positive opinion of you. The abstract of this paper seems to indicate increased liking of a stranger that does this, but paywalls and general laziness prevent me from getting a more comprehensive idea of what can happen.
Connected to this: A preemptive favor is more likely to result in later requests (even if larger than the initial favor) being fulfilled, but the end result may or may not be a more positive opinion of you. The abstract of this paper seems to indicate increased liking of a stranger that does this, but paywalls and general laziness prevent me from getting a more comprehensive idea of what can happen.