prefix() not working for a Select form field?

Forms\Components\Select::make( 'dollars' )
                                                ->prefix('US$')
                                                ->suffix('per day')
                                                ->options([
                                                    '1' => '50',
                                                    '2' => '100',
                                                    '3' => '200',
                                                    '4' => '500',
                                                ]),