Sure. There are many, but here are a couple …
Chapter II: Resource Management
… When raising one hundred thousand soldiers and settling out on a campaign of one thousand li, the expenses of the hundred clans and the contributions of the nation are one thousand gold pieces a day. …
Translation:
The cost of warfare is incredibly expensive and is a drain both financially (the citizens have to pay higher taxes), but is a drain on the population. People are fighting war instead of farming, working in factories, etc.
In this case, when you read further in the chapter he is talking about using spies ahead of time. Much less financial resources are needed because it’s just a few spies instead of a hundred thousand soldiers. All those soldiers need food which means people are needed to transport the food, which costs money.
Essentially, allocate your resources better, both in terms of people and finances. Sun Tzu also advices not to drag out war because of the cost, again, financially but also due to a loss of people, including being killed in war.
Bottom line, plug financial leaks.
Chapter VI: Strength and Weakness
… Advance in a way that leaves no room for resistance - strike where the enemy is weak. Retreat in a way that cannot be pursued. Move swiftly and out of reach. …
Translation:
Efficiency, again to save money. Have a smaller, but well trained army. Also this is about finding people who are adaptable to the situation, and knowing how to exploit the enemy’s weakness.
Chapter VIII: Strategy and Maneuver
… Therefore, one must advance rapidly, without delay, both day and night, doubling the pace, …
Translation:
This is about efficiency again, in order to save money and time.
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These are just a couple examples, but so many of the chapters go into various different ways of efficiency. Planning ahead of time by doing research on your enemy (or markets; competitors; etc). Not hiring too many people because of the ongoing cost (or making too many trades in the markets; or having too many products that aren’t producing a profit, etc).
Not every single chapter is about efficiency, but most are and again, the main reason is to reduce costs which in this case meant higher taxes to the citizens and loss of people who could be farming, producing things in factories, having children, etc.