Learn Hardcore Turkish: Enflasyondaki azalma eğilimi fiyatları makul seviyeye çekti. - The downward trend in inflation brought prices down to reasonable levels.

The suffix -ki attaches to a noun in a locative case (here enflasyonda, “in inflation”) to form a relative adjective meaning “which is in/at inflation.” So enflasyondaki literally means “the one in inflation,” and it modifies azalma eğilimi to give “the downward trend in inflation.”

What is the structure and meaning of azalma eğilimi?

azalma = azalmak (to decrease) + -ma (noun-forming suffix) ⇒ “a decrease”
eğilim = “tendency”
The -i on eğilim is the 3rd-person possessive suffix making it definite: “the tendency of that decrease.”
Put together, azalma eğilimi means “the decrease’s tendency,” i.e. “downward trend.”

Why is fiyatları in the accusative case and what does the -ı suffix do?

fiyatlar = “prices.”
-ı is the definite accusative marker, so fiyatları = “the prices.”
This tells us that fiyatları is a specific direct object of the verb çekti. Without -ı, it would mean “prices” in a general, indefinite sense.

Why is seviye inflected as seviyeye, and what case is that?