Double 一 (yī) means solid beginning, while paired 八 (bā) sounds like double «发财» (fācái) — to get rich. Ancients said: «一发再发» (yī fā zài fā) — prosperity upon prosperity. Lucky number for business.
History
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Western numerology
Double ones forge the path to independence, while paired eights build foundation for material prosperity. The root nine brings understanding: true wealth lies in wisdom and service to others.