How much credits should be invested in a listing? Also, how many credits would translate into what level of visibility?

The number of credits required to be invested in a listing would be different for each listing. You would be able to gauge the current visibility of your listing through an intuitive curve graph that shows credits spent (x-axis) against visibility (y-axis) and explicitly calls out the position of your listing on that graph.

The graph also shows the movement in visibility with increase in invested credits and recommends an ideal number of credits that should be spent on that listing. This recommendation is based on the visibility of listings of competitors in that locality and the average boost credits being used by competitors.