Joseph finalizes his economic strategy by defining the ultimate purpose of the gathered grain: it will serve as a vital strategic reserve to ensure the kingdom's survival. Naturally, the plan does not call for seizing the entirety of Egypt's agricultural output. Such a drastic measure would cause immediate starvation during the years of plenty. Instead, the focus is strictly on collecting and securing a specific, designated portion of the harvest [רש״י, מזרחי, גור אריה].
This gathered grain is to be treated as a strict deposit, a concept understood in two distinct ways. On one hand, it is not a standard legal deposit, as the grain ultimately belongs to Pharaoh. Rather, it functions like a guarded treasure, akin to hoarded silver or gold, locked away exclusively for a future crisis and untouched for any other use [רש״י, רד״ק, גור אריה, דברי דוד]. Conversely, others view it as a literal deposit entrusted to Pharaoh's officials. Just as a watchman is forbidden from taking a deposited item for personal use, the officials are barred from using this grain for any outside purpose. It is held in faithful trust for its true owners: the citizens of the nation [רמב״ן, רבנו בחיי, ביאור יש״ר].
When the strategy speaks of saving the land, it refers directly to the people living in it, rather than the physical soil [שפתי חכמים, נתינה לגר]. By storing the food locally within each city, the plan guarantees that every community can first sustain itself from its own reserves. Only after the needs of the Egyptian population are fully met will any surplus be diverted for international trade, enriching the royal treasury by selling to other nations [אור החיים, מלבי״ם].
The ultimate guarantee of this plan is that the population will not be wiped out by the coming famine. This promise brings Pharaoh's dream full circle. Just as the lean cows survived after consuming the fat ones, despite remaining thin and frail, the Egyptian people will survive the devastating years of hunger. They may endure poverty and hardship, but they will not perish [רמב״ן, רבנו בחיי, ביאור יש״ר]. Ultimately, while the immediate focus of this massive undertaking is the survival of Egypt, the resulting salvation will extend far beyond its borders, providing a lifeline for the entire world as it comes to rely on these carefully managed reserves [אור החיים].