Four-Character Idiom Senjafuda Sticker 千社札ステッカー【百鬼夜行 - HYAKKI YAGYO-】
 
This phrase is not a four-character idiom, but in Japan, it is commonly used to express the wish for business prosperity, increased sales, and economic success.
 
【商売繁盛】 (Shoubai Hanjou) is a Japanese phrase that means "prosperous business" or "business success." It conveys the wish for thriving commerce, good sales, and financial success. This phrase is often used in good luck charms, business settings, or during traditional ceremonies to pray for continued growth, customer satisfaction, and overall prosperity in business ventures. It reflects a hope for flourishing trade and the success of one’s enterprise.
 
・ステッカー　sticker