21 The purchaser responded as follows on the principal issue: - (i) the proposition that a claim must be "valid" to be made is self-evidently wrong as many claims must ultimately fail at arbitration, (ii) a claim under cl 7 is any claim that has a proper or reasonably arguable basis and is not frivolous, vexatious or made in bad faith, (iii) the purchaser's claim was based on pre-contractual conduct that was misleading or deceptive or likely to be so and on which the purchaser relied to enter into the contract (namely, that the tenant was a secure long-term tenant which was only in arrears for one month when, in fact, a back calculation from the arrears notified by the vendors' solicitor of $253,850 as at 16 March 2007 indicated that the tenant had ceased meeting its obligations in about July 2006), (iv) cl 7, in terms, contemplates claims outside the scope of cl 6 and for matters arising after the contract that sound in damages (delay in completion), (v) Peter Butt, The Standard Contract for Sale of Land in New South Wales (2nd ed., 1998) paragraph 7.3 adopts a broad approach to claims under cl 7, including claims for damages under trade practices legislation for misleading or deceptive conduct, (vi) this broad approach is consistent with the development of the provisions of the standard contract for sale that show a widening of the scope for claims over time and the concomitant role of arbitration to finalise those claims (for example, the 1988 standard contract limited cl 7 to errors and misdescriptions and authorised the arbitrator with respect only to the "amount to be settled"), (vii) a narrow approach to claims under cl 7 would be inimical to the scheme of the contract, as it would tend to encourage unilateral rejection of a purchaser's claim (as occurred in this case) rather than resolution by the process of arbitration the contract expressly contemplates, (viii) the claim in this case was made in good faith and on a reasonably and properly arguable basis, this being sufficient to bring the claim within cl 7, and (ix) the fact that the purchaser was ultimately proved wrong about the effect on the value of the property (the property having sold with vacant possession some months later for a substantially increased price) does not undermine the efficacy of the claim when made.