Final answer:
The reference material provided discusses the history of oligopolistic practices in the soap industry but does not specify which soap manufacturer does a significant percentage of business with Wal-Mart.
Step-by-step explanation:
The student's question seems to inquire about a specific soap manufacturer that does a substantial portion of its business with Wal-Mart. However, the provided reference material does not specifically name a company in such a relationship with Wal-Mart. Instead, it discusses oligopolistic practices in the soap industry, with historical context regarding manufacturers like Procter & Gamble, Henkel, Unilever, and Colgate-Palmolive dominating the market and participating in anti-competitive behavior. Such history highlights the development of the industry and the importance of competition laws. For accurate details regarding current business relationships between soap manufacturers and retailers like Wal-Mart, one would need to consult up-to-date industry reports or company filings.