I'm using R to create a competitive map of strategic groups in the industry I'm researching. The number of outlets is along the x-axis, Sales is the y-axis as well as the size of the bubble. Code used:
qplot(data = supermarket, x = outlets, y = sales, size = sales, color = retailer)
However, I need to increase the overall size of the bubbles as it is too unclear at the moment. Please see below for an example.
What I need is to have the bubbles keep their size relative to sales but become larger overall to increase the visibility.