Based on Zachary's skills and experience, I'm estimating an hourly rate of $100. This is a relatively conservative estimate, as the provided skills don't include any high-demand technical skills like programming or data science. However, his experience in supply chain management, negotiation, and marketing strategy are valuable in various industries. The location in St Louis, Missouri, also suggests a more moderate rate compared to major cities like New York or San Francisco. Average salary ranges for supply chain managers in the US are around $80,000-$110,000 per year, which translates to approximately $38-$55 per hour. Considering Zachary's education and skills, I'm rounding down to $100 per hour.