Defendant contends that plaintiffs’ cause of action, not being on behalf of a member of the travelling public, is barred by the doctrine of governmental immunity.
It is generally held that the duty of keeping sidewalks in a reasonably safe condition rests primarily on a municipality. A municipality may not undertake a task of street improvement or repair in a careless or negligent fashion and then seek to escape liability by invoking the privilege of governmental immunity. Numerous cases have held that the exercise of due care in keeping streets and public ways safe and in suitable condition is a positive obligation imposed upon a municipal corporation. A municipality cannot, with impunity, create in its streets a condition palpably dangerous, neglect to provide the most ordinary means of protection against it, and avoid liability for proximate injury on the plea of governmental immunity. See Hunt v. High Point, 226 N.C. 74, 36 S.E. 2d 694; Millar v. Wilson, 222 N.C. 340, 23 S.E. 2d 42; Waters v. Belhaven, 222 N.C. 20, 21 S.E. 2d 840; Meares v. Wilmington, 31 N.C. (9 Ire.) 73. The same principle of liability applies when a municipality undertakes a task of street or sidewalk improvement in a careless or negligent fashion and causes damage to the property of an adjoining property owner.
*171The evidence discloses that damage to plaintiffs’ property was the result of concrete dust permeating and infiltrating the interior of plaintiffs’ store. The dust arose from the fall of broken concrete into the basement bays of the store. Testimony reveals that city representatives knew that concrete and dust would fall into the basement area. The record reveals that cardboard was placed over one of the two basement bays. However, it is not clear whether the purpose of the board was to block out large chunks of concrete or to eliminate all foreign particles from the basement area. Regardless, it was known by city representatives that amounts of concrete and dust would fall into the basement area.
The duty to maintain sidewalks and streets in a safe condition carries with it a correlative duty to perform these maintenance tasks in a competent manner or suffer the consequences of negligently inflicted damage which is foreseeable. The evidence justifies a finding that defendant’s crew was negligent in performing the work without taking sufficient precautions to safeguard plaintiffs’ property from dust damage or advising plaintiffs of the risk of dust in the area. This assignment of error is overruled.
Defendant contends that the method of replacing the sidewalk had been used extensively in similar work, and that the spread of dust was accidental, unintended, and due to unforeseeable conditions beyond the control of defendant.
Testimony of witnesses employed by defendant reveals that these witnesses were aware that in breaking up the sidewalk, chunks of concrete would fall into the bay areas of the basement, spreading concrete particles and dust.
Negligence, to be actionable, must be a proximate cause of the injury, and foreseeability is an essential element of proximate cause. A defendant is not required to foresee occurrences which are merely possible, but only such occurrences which are reasonably foreseeable.
Under the circumstances presented by the evidence in this case, defendant should have foreseen and should have known that dust would be spread by the pieces of concrete dropping into the bay areas underneath the sidewalk. This assignment of error is overruled.
*172Defendant contends plaintiffs were guilty of contributory negligence since plaintiffs were advised of the nature of the work before excavation began, had peculiar knowledge of the special conditions affecting the interior of the store, and failed to take action to prevent damages.
“Contributory negligence, as its name implies, is negligence on the part of plaintiff which joins, simultaneously or successively, with the negligence of the defendant alleged in the complaint to produce the injury of which the plaintiff complains.” Jackson v. McBride, 270 N.C. 367, 154 S.E. 2d 468.
Defendant is contending that plaintiffs failed to take any defensive action against a danger which plaintiffs were unaware would come about. The evidence reveals that the only information plaintiffs received was in the form of a visit by a city representative who informed them that the sidewalk was going to be torn up directly above the basement. Later that same afternoon, city representatives went into the basement and tacked cardboard panels over the opening of the west bay. Plaintiffs were not informed of the manner in which the job would be done or the possible results of such actions.
Plaintiffs cannot be found contributorily negligent for failure to avert to minimize dust damage when they were uninformed that falling chunks of concrete and airborne dust particles would be by-products of the sidewalk excavation process. Refusal by the trial court to submit the issue of contributory negligence was not error. This assignment of error is overruled.
Defendant contends that the trial court erred in allowing testimony of damages based on retail selling prices. “North Carolina is committed to the general rule that the measure of damages for injury to personal property is the difference between the market value of the damaged property immediately before and immediately after the injury. The purpose of the rule is to pay the owner for his loss.” Light Company v. Paul, 261 N.C. 710, 136 S.E. 2d 103.
The purpose of the rule is to return the owner to his status prior to the incident which damaged or destroyed the personal property. The rule is not intended to award prospective profits. Profits are contingent upon the goods being sold and upon the business expertise of the owner. Rather, the rule is intended to *173afford compensation to the owner in an amount sufficient to buy goods identical to those damaged or destroyed, plus compensation for any expenses incurred by the owner in attempts to minimize damages, less any salvage obtained in a sale or exchange of the damaged goods. Anticipated profits of a non-conjectural nature which can be demonstrably proven by reliable records, accumulated over a reasonable period of time, dealing in such goods, may also be included as factors of compensation.
Plaintiffs’ witness Gary, tendered as an expert witness on the value of children’s toys, gave his opinion of damages to the merchandise in terms of percentages of the retail prices. He testified: “I said on the first floor I estimate damage to be 75% of the retail value of the merchandise. In the basement, I estimate the damage to be 85% of the retail value of the merchandise. And, on the top floor, I estimate the damage to be 66%% of the retail value of the merchandise.” Evidence of this nature, when coupled with evidence of the retail value of the inventory, would be competent as tending to establish the salvage value of the merchandise. However, the court did not instruct the jury upon how this evidence was to be considered. There was no instruction of any nature that the salvage value of the merchandise was to be considered. The jury was permitted to consider evidence of damage to the retail value of the merchandise without limits upon its applicability. This was error prejudicial to defendant.
New trial.
Judges Morris and Carson concur.