The conditions set forth in Section 59541 vitally concern the health, peace, safety and general welfare of the people of this state. It is declared to be the policy of this state to aid agricultural producers in preventing or correcting adverse marketing conditions, improving existing marketing conditions, expanding existing markets, promoting new or broader markets, developing more orderly or efficient or equitable methods in the marketing of commodities and thereby to aid agricultural producers to achieve and maintain a purchasing power at an equitable and reasonable level.