Costly signaling loses its value when everyone shares identical traits, resources, and cooperative intentions, but it gains significance as population variability in these aspects increases.
kˈɔstli sˈɪɡnəlɪŋ lˈuːzᵻz ɪts vˈæljuː wɛn ˈɛvɹɪwˌʌn ʃˈɛɹz aɪdˈɛntɪkəl tɹˈeɪts, ɹᵻsˈoːɹsᵻz, ænd koʊˈɑːpɚɹətˌɪv ɪntˈɛnʃənz, bˌʌt ɪt ɡˈeɪnz sɪɡnˈɪfɪkəns æz pˌɑːpjʊlˈeɪʃən vˌɛɹɪəbˈɪlᵻɾi ɪn ðiːz ˈæspɛkts ˈɪŋkɹiːsᵻz.