在大美，川關稅之前汽車After-market 品牌的汽車零件的毛利率大約 25% 到 35%；純利不高，

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Distributors/Jobbers (e.g., NAPA, AutoZone, O’Reilly)

Margins often range?25–30%?for branded parts.

May be slightly higher with volume rebates or exclusive lines.

Installers/Repair shops

They may mark up branded parts by an additional?40–100%?over jobber cost (though that’s more retail markup than wholesale margin).

Online retailers (e.g., RockAuto, PartsGeek)

Tend to run leaner on branded parts:?20–30%, compensating with volume and low overhead

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純利率大約

Business Model	Typical Net Margin
Large Distributors (e.g., Genuine Parts Co./NAPA)	5–8%
Retail Chains (AutoZone, O’Reilly)	8–10%
Online Retailers (RockAuto, Amazon auto parts)	3–7%

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