Final answer:
Inherent and control risks at Niagara Dairy are affected by poor documentation, variable pricing, and oversight issues, leading auditors to potentially prefer a substantive audit strategy. This approach focuses on verifying transaction and account details due to low control reliability.
Step-by-step explanation:
The factors that would affect the preliminary assessment of inherent risk and control risk at Niagara Dairy include the complexity of transactions, Jim's informal approach to documentation and pricing, and high dependence on the export business. For instance, poor documentation and informal pricing strategies elevate the inherent risk of inaccuracies in financial statements. Moreover, the lack of oversight from Jim's brother, Bob, and the sales department increase control risks as there may be inadequate controls over the agreement of transaction terms and subsequent invoicing.
Given the high inherent and control risks, an auditor might lean towards a substantive audit approach, focusing on detailed tests of transactions and account balances. This is because a substantive strategy would allow the auditor to independently verify the existence, accuracy, and completeness of the sales, inventory, and accounts receivable records due to the low reliability in the company's internal controls.