This article examines what I describe as a “fleeting moral economy,” a system of culturally shared mores formed among migrant women who are engaging in illegal and stigmatized activities in urban areas. I suggest that the rationale or norm for the particular value of reciprocity varies not only by the complexity of a society or a culture, but also varies due to specific networks or communities depending on their particular circumstances, especially level of resource needs. This short communication is the product of my 27 months of ethnographic field work in post-reform southern China.