At the centre sits the שׁוּק, the market: the crowded place where goods are pushed and sold. From it Hebrew makes the modern verb "to market" and its action-noun "marketing". The same root carries an older, deeper sense of being driven toward something, which surfaces in תְּשׁוּקָה, longing or desire, the pull that drives a person. This is a hollow root: its middle letter ו is a vowel-carrier that appears and disappears across the forms. Every word here is verified against pealim, niqqud included.
The same root runs through the verb system. Each binyan is a voice: it bends the one idea into active, passive, causative or reciprocal. Tap to hear.
Modern Hebrew lexicalizes this root in the pi'el (deliberate, active selling). The hollow ו becomes a doubled וּ when the binyan demands a strong middle consonant, which is why you see שַׁוֵּק. The passive pu'al (to be marketed) exists in usage but is not a separate dictionary infinitive; the other binyanim are not lexicalized here.
Same root letters, different noun moulds (mishkalim). The mould tells you the function: who does it, the act of doing it, or the thing produced.
Strip the prefixes, suffixes and vowels. Three consonants remain, and the meaning lives there.