19 At the very least there was imposed upon Network an obligation to act in its own interest by reference to a standard of reasonableness.[10] In that regard I draw attention to a number of matters in the definition of the words "Material Adverse Effect" in clause 1.18 which was incorporated into clause 5.4.2. First, that the definition of "Material Adverse Effect" was not expressed to be inclusive with its meaning at large. Secondly, and significantly, that a necessary condition to the existence of a material adverse effect (as defined) was an hypothesis of what Network "would have" sought to do presupposing Network "acting reasonably".[11] The need to determine the existence of a material adverse effect by reference to a standard of reasonableness suggests an objective standard,[12] and, at very least, prevented Network's reliance upon a contractual hypothesis that was not reasonable. Thirdly, that the definition of a material adverse effect depended upon the predication or prediction that Network (upon the test of reasonableness just described) "would have sought" to reduce the relevant price. The use of the words "would have" may be usefully contrasted with such other words as could have been, but were not, used like "might have sought" or "could have sought". The words "would have" are words requiring a confident prediction about what Network would have done in the circumstances approximating certainty and not mere possibility.[13] Fourthly, that the definition contemplated the prediction that Network would have sought a reduction of the purchase price of an amount capable of calculation to some degree of precision; that is to say, the definition contemplated that it would be possible to predict that Network would have sought a reduction of "the amount" of the purchase price, if not by an exact figure (as the use of the definite article might ordinarily suggest), but at least by some amount capable of calculation in excess of $500,000. Fifthly, that the result that Network would have sought to reduce the purchase price was a result caused by objective information, namely that "disclosed by or identified during the due diligence process"; that is to say, that the occasion of the awareness of a material adverse effect had to be found in objective facts and circumstances capable of identification. Sixthly, that the adverse effect which permitted Network to give a notice under the clause was both described as "material" and specifically defined as being "more than $500,000".