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Reply - Iain Currie 147<br />

revisited and replaced with something more theoretically sound. Stu<br />

clearly thinks the two forms are different and that the direct/indirect<br />

distinction makes a difference. But I could not immediately find in the<br />

text a convincing explanation of why (but it is, as I may have<br />

mentioned, a lengthy text and I have to confess that I have postponed<br />

reading that famous Appendix until my next sabbatical). So <strong>this</strong> is my<br />

opportunity to ask him in person and is the point of these remarks. Is<br />

direct horizontality necessary? Is there any reason other than the<br />

beauty of our theories to bother with it?

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