Building emotional relationships from scratch is no easy feat.
Moreover, ordinary strangers don't hold much worth. According to Ren Suo's calculations, one "friend who can lend money" should equal four "acquaintances who merely nod in greeting."
Of course, due to the diminishing marginal utility of friendship, once the value of a friendship reaches a certain level, it becomes very hard to increase unless it can break through to the four-digit "close friend" level.
There is a dynamic equilibrium in this. If expressed mathematically, it would be the (1, +∞) interval of y=lnx. When the X-axis represents time and the Y-axis represents emotional value, although this interval is monotonically increasing, there inevitably exists a point at which Ren Suo can achieve the maximum emotional value with the least investment of time.
This is Ren Suo's most efficient point of harvesting emotions.
