Final answer:
The phrase 'eye to eye' is an idiomatic expression used to indicate that two parties have come to an agreement in a business deal.
Step-by-step explanation:
When it is said that two parties "finally saw eye to eye on the business deal," it indicates that they reached a mutual understanding or agreement after perhaps initially having different opinions or positions. This expression is an example of an idiomatic phrase, which is a type of figurative language used to imply something other than the literal meaning of the words. Referring to the context provided, where Zerkow reluctantly agrees to the price of Maria's junk, we can infer that they eventually found common ground on the terms of the transaction, aligning their perspectives to close the deal satisfactorily. In general, finding common ground is essential in any business negotiation or bargain, as reflected in the given excerpt.