Costco looks priced for perfection.Costco Wholesale (COST -0.53%) has been one of the biggest winners in the retail sector over its history. Its simple business model of selling bulk goods at bargain prices while collecting lucrative membership fees has generated a wide economic moat and driven steady growth.However, one analyst is calling time on the latest Costco rally, effectively forecasting a decline in the stock. Truist downgrades CostcoCostco shares keep churning higher, but those gains have come pre ...