adjective

having or showing shrewdness and good judgement, especially in money or business matters.

canny investors will switch banks if they think they are getting a raw deal

shrewd,astute,sharp,sharp-witted,discerning,acute,penetrating,discriminating,perceptive,perspicacious,clever,intelligent,wise,sagacious,sensible,judicious,circumspect,careful,prudent,cautious,cunning,crafty,wily,artful,calculating,on the ball,smart,savvy,suss,sussed,pawky,heads-up,as sharp as a tack,whip-smart,long-headed,sapient,argute