This liquidity injection was done in PKR and not in USD and if anything this liquidity injection would have made the price of dollar go up, not down. Furthermore, SBP routinely does this in order to indirectly loan money to the government. This is because, in accordance with the program established by the International Monetary Fund (IMF), the government is not permitted to borrow money directly from the SBP. As a result, the central bank will pump this liquidity into commercial banks, and the commercial banks will then utilize this money to buy government assets.