The first page of the new financial report was immaculate. The second contained a handwritten correction from Gao.
Under operating cost, the analyst had listed energy, maintenance and contracted reserve. Gao added lost production from waiting for a replacement bearing. The bearing was cheap. The delay had occupied half a shift and forced one crew to return on Saturday.
“That’s not an energy cost,” the analyst said.
“No,” Gao replied. “It’s a consequence of a decision you’re asking us to change.”
Yanchuan examined the proposed model. It optimized when to run cooling equipment and when to defer flexible demand. The headline saving came from shifting consumption away from expensive hours. But when the schedule slipped, some loads were no longer flexible. They belonged to a production process already waiting for parts, staff and delivery slots.
“Don’t add everything to electricity,” Ning said. “Keep separate accounts for different consequences. We should still know which decisions could have caused them.”
The team interviewed operations staff across two shifts. A technician described a repair postponed because the purchasing system had classified a required part as nonurgent. A cleaner described overtime after an unexpected delay left the floors occupied until midnight. A warehouse supervisor showed a list of products whose temperature requirements allowed no pause at all.
The stories did not all belong in a monetary saving. Some did. Others were hard constraints or reasons for leaving a recommendation unused.
Guo asked for a figure he could take to an investment committee.
“An interval,” Yanchuan said. “With the assumptions beside it.”
The estimate was less attractive when staff hours, reserve testing and failed delivery windows were included. Still, the pilot had improved certain decisions. Ning could name them without stretching the evidence: earlier warning about a demand peak, fewer unnecessary starts, and better records of why operators refused a suggestion.
“What would it cost to run this service for three years?” Guo asked.
They had counted software support but not every replacement sensor, shift handover and training session required to keep the tool useful after the original team left. Gao made a list on the whiteboard. It extended below the frame.
“If you don’t fund those,” he said, “the model will become a screen nobody trusts.”
At dinner Chen admitted that the first proposal had been priced as if the team would always be available to explain its decisions without charge.
“It’s easy to sell your own future time,” he said. “The invoice arrives later.”
Yanchuan thought of his father’s emergency savings and of An’s line for another journey to Kenya. Both were funds held for an event they hoped would not demand them. The factory’s maintenance reserve was the same kind of promise, though it belonged to different people under a different contract.
An called while he was rewriting the costing note. She had found a discrepancy in a household payment made during the search. It was a small foreign-transaction fee, charged three times because an expense had been split into separate transfers.
“It’s not worth arguing about,” she said.
“Then why did you find it?”
“Because the balance didn’t match. Now we know why.”
She did not ask him to recover the fee. She wanted their records to describe what had actually been spent. He sent her the current family expense summary, and she corrected an item he had categorized as transport when it was accommodation.
The total stayed the same. The explanation became more accurate.
At work Yanchuan returned the factory report with costs grouped according to who actually paid them: engineering provider, factory operator, contracted suppliers and workers asked to change shifts. The last column prompted an uncomfortable discussion. Nobody wanted to treat a worker’s disrupted day as free simply because payroll had not recorded overtime.
Guo approved a revised feasibility study. He also asked whether another customer with different working conditions would obtain the same result.
“No,” Yanchuan answered. “We would have to measure their conditions.”
“That’s inconvenient for scaling.”
“Then the scaling plan needs a cost for finding out.”
In the evening a case update from Wanjiru said the document packet associated with the annex had been inventoried through the authorized procedure. It included correspondence about restoration approval but no conclusive evidence of Yansheng’s subsequent movements. The technical issue continued to be documented. The disappearance did not acquire an ending.
Yanchuan filed the update without reopening his travel search.
On Saturday he visited Guangzhou. His nephew was selling imaginary tickets to cross a bridge built from paper rolls. Yanchuan asked where the money went.
“To buy more tape,” the boy said.
“And if the bridge breaks?”
“Then nobody gets across. I’ll give their tickets back.”
An laughed. “He has better refund terms than some suppliers.”
The boy counted his paper coins carefully, then discovered he had not included a price for replacing the cardboard underneath. He drew another box on his ledger.
Yanchuan watched him solve the problem without pretending it was complicated enough to require a machine.
The next factory revision included the maintenance reserve, the cost of human review and a separate table of costs the model could not justify assigning to itself. A project could be valuable without claiming credit for everything good that happened around it.
He folded Gao’s handwritten correction inside the printed summary before the next client meeting, where the second page would be harder to ignore.
Yanchuan saved both pages together.