Henry Billings Brown,
Shipman v. Straitsville Central Mining Company…
“ The fact that he had agreed to labor to improve the market price of coal, giving the other parties the advantage of whatever improvement might be made in the market, to which the companies were to lend their aid and encouragement, tends to show that the relations between them were different from those between an ordinary vendor and vendee. Indeed, the fact that the contract provides that he was to represent the entire interests and sales of the companies in the Detroit trade; that he could only sell soft coal received from them ”
