Bounding the diameter-width ratio using containment inequalities of means of convex bodies

We completely describe the region of possible values of the diameter-width ratio for planar pseudo-complete sets in dependence of the Minkowski asymmetry. In order to do this, we focus on the containment inequalities of $K\cap (-K)$ and $\frac{K-K}{2}$ for a Minkowski centered convex compact set $K$, i.e. we define $\tau (K)$ to be the smallest possible factor to cover $K\cap (-K)$ by a rescalation of $\frac{K-K}{2}$ and give the region of the possible values of $\tau (K)$ in the planar case in dependence of the Minkowski asymmetry of $K$.