This is the 11166th most frequent Polish word.
gospodarczą
The Polish word "gospodarczą" means "economic" or "pertaining to the economy" (feminine singular instrumental form).
In this sentence, "gospodarcze" is an adjective describing "trudności" (difficulties), indicating that these difficulties are of an economic nature.
Polska przechodzi przez trudności gospodarcze.
Poland is going through economic difficulties.
Here, "gospodarczej" is in the genitive singular feminine form matching "stabilności," describing that the stability pertains to the economy.
Podjęliśmy działania na rzecz gospodarczej stabilności kraju.
We took actions toward the country's economic stability.
"Gospodarczego" modifies "rozwoju" (development) and is in the genitive case due to the governing noun phrase structure.