<prompt> Translate the following text to EnglishAmetaka Marekani kujiunga na vituo vingine vya kifedha katika kupitisha ushuru wa shughuli kwenye kubadilishana sarafu ili kuzuia uvumi na kuzuia mabadiliko makubwa katika thamani ya sarafu.  <response>: He wants the United States to join with other financial centers in adopting a transactions tax on currency exchanges to stanch speculation and inhibit wide swings in currency values. 