In requiring reasonable inquiry before the filing of any pleading in a civil case in federal district court, Rule 11 demands 'an objective determination of whether a sanctioned party's conduct was reasonable under the circumstances.' Brown v. Federation of State Medical Boards, 830 F.2d 1429, 1435 (7th Cir. 1987). See also In re Ronco, Inc., 838 F.2d 212, 217 (7th Cir. 1988). In effect it imposes a negligence standard, cf. Pantry Queen Foods, Inc. v. Lifschultz Fast Freight, Inc., 809 F.2d 451, 453 (7th Cir. 1987); Classic Components Supply, Inc. v. Mitsubishi Electronics America, Inc., 841 F.2d 163, 165 (7th Cir. 1988); Gaiardo v. Ethyl Corp., 835 F.2d 479, 482 (3d Cir. 1987), for negligence is a failure to use reasonable care. The equation between negligence and failure to conduct a reasonable precomplaint inquiry is transparent in Szabo Food Service, Inc. v. Canteen Corp., 823 F.2d 1073, 1083 (7th Cir. 1987), where we said that 'the amount of investigation required by Rule 11 depends on both the time available to investigate and on the probability that more investigation will turn up important evidence; the Rule does not require steps that are not cost-justified.' See