resentation or nondisclosure and the plaintiff’s injury.
III.
CAUSATION OR JUSTIFIABLE RELIANCE
The Second Circuit has held scienter to be an essential element in a civil action under Rule 10b-5. Shapiro v. Merrill Lynch, Pierce, Fenner & Smith, 495 F.2d 228, 238-239 (2d Cir. 1974). The scienter element here required furnishes a basic element of causal connection which imposes a limitation on the defendant’s liability. Globus v. Law Research Service, Inc., 418 F.2d 1276, 1292 (2d Cir. 1969), cert. denied, 397 U.S. 913, 90 S.Ct. 913, 25 L.Ed.2d 93 (1970). The causal relationship provided by proof of reliance or materiality sufficiently satisfies the need for causal link. Titan Group, Inc. v. Faggen, 513 F.2d 234 (2d Cir.), cert. denied, 423 U.S. 840, 96 S.Ct. 70, 46 L.Ed.2d 59 (1975).
The Supreme Court in Affiliated Ute Citizens of Utah v. United States, 406 U.S. 128, 92 S.Ct. 1456, 31 L.Ed.2d 741 (1972), considered the reliance element in the 10b-5 action. Its decision was that where the deceit arose from nondisclosure, proof of reliance was unessential. A bank had purchased securities from a group of unsophisticated investors and had failed to disclose that the securities were being sold at a higher price in a market made by the bank. The court of appeals had ruled that the plaintiffs could not recover for failure to prove reliance. See Reyos v. United States, 431 F.2d 1337 (10th Cir. 1970). The Supreme Court reversed the Circuit Court and said:
[ujnder the circumstances of this case, involving primarily a failure to disclose, positive proof of reliance is not a prerequisite to recovery. All that is necessary is that the facts withheld be material in the sense that a reasonable investor might have considered them important in the making of this decision. * This obligation to disclose and the withholding of a material fact establish the requisite element of causation in fact.
406 U.S. at 153-154, 92 S.Ct. at 1472.
Under the circumstances of that case, involving primarily a failure to disclose, the effect of the Supreme Court’s ruling is, then, not to eliminate reliance as an element but rather to recognize the difficulty of proving reliance in a failure to disclose situation. In this nondisclosure situation, once causal connection is proven by showing materiality, that is to say, whether a reasonable investor would have considered the withheld facts important, Affiliated Ute Citizens of Utah v. United States, supra; List v. Fashion Park, supra, the reliance element is inferred. Titan Group, Inc. v. Faggen, supra, at 238-239; Shapiro v. Merrill Lynch, Pierce, Fenner & Smith, supra, at 239-40; see generally, Note, The Reliance Requirement in Private Actions Under SEC Rule 10b-5, 88 Harv.L.Rev. 584 (1975).
Where, as here, there are affirmative misrepresentations, the problem of proving reliance is not the same and reliance is the appropriate and decisive way to prove the chain of causation. Titan Group, supra; see also Note, 88 Harv.L.Rev. 584 (1975). Unquestionably the proof of reliance or materiality is essential to the case where it is a positive misrepresentation type of action and justifiable reliance is the required element. Frigitemp Corp. v. Financial Dynamics Fund, Inc., 524 F.2d 275, 282 (2d Cir. 1975) (semble). All of this, however, is quite different from superimposing on the plaintiff the standard of due care. Under that standard the plaintiff would not be heard to say that he relied on misrepresentations which were obviously false.
Our court also requires proof of causation as a condition to recovery. See for example Financial Industrial Fund, Inc. v. McDonnell Douglas Corporation, 474 F.2d 514, 517, 521 (10th Cir.), cert. denied, 414 U.S. 874, 94 S.Ct. 155, 38 L.Ed.2d 114 (1973) (plaintiff must “demonstrate reliance on the acts or inaction of the defendant”); Clegg v. Conk, 507 F.2d 1351 (10th Cir. 1974), cert. denied, 422 U.S. 1007, 95 S.Ct. 2628, 45 L.Ed.2d 669