b$.$ Illustrate the effect of entry on the average Goleta price by a shift of the short$-$run supply curve, the demand curve, or both.

$\backslash$table$[[$Santa Barbara Cleaners,Goleta,$2\mathrm{.}00],[$Sunny Cleaners,Santa Barbara,$2\mathrm{.}00],[$Casitas Cleaners,Carpinteria,$2\mathrm{.}10],[$Rockwell Cleaners,Carpinteria,$2\mathrm{.}10],[$Norvelle Bass Cleaners,Santa Barbara,$2\mathrm{.}15],[$Abitt$\text{'}$s Fine Cleaners,Santa Barbara,$2\mathrm{.}25],[$California Cleaners,Goleta,$2\mathrm{.}25],[$Justo the Tailor,Santa Barbara,$2\mathrm{.}25],[$Pressed $4$ Time,Goleta,$2\mathrm{.}50]]$