Meanwhile, Australias two main supermarket chains, Speers and Grocery Mart collectively control over 70% of the market share, giving them substantial market power. Speers is the larger of the two supermarket chains. It has required several of its suppliers, particularly smaller local food producers, to sign contracts, preventing them from supplying their products to other retailers. These contracts have placed significant financial pressure on local suppliers who are heavily reliant on Speers for distribution. Many small producers claim they have been forced into these agreements. High-level executives from Speers and Grocery Mart have allegedly entered into an agreement to coordinating prices on essential food items like bread, dairy products, and meat.

What are the legal issues in the above case? provide the issues with an example from the case.