Abstract　 　 
Correlations between the radio and X-ray bands in the hard state of black hole X-ray binaries have led to the discovery of the so-called Fundamental Plane (FP) of black hole accretion, linking accretion-driven radiative output to black hole mass. After a brief summary of the FP phenomenology, drivers and implications, I will focus on how we can exploit this mass scaling to learn more about the relationship between accretion inflow and jets near their launch point in black holes. In particular I will highlight how we can place our Galactic center supermassive black hole, Sgr A*, into context with other sources. I will also discuss some ideas mass-scaling comparisons are giving us about how jet dynamics and particle acceleration may be set by conditions close to the black hole .