class='op'>{</span>
<span class='kw'><a href='https://rdrr.io/r/base/library.html'>library</a></span><span class='op'>(</span><span class='st'><a href='https://magrittr.tidyverse.org'>"magrittr"</a></span><span class='op'>)</span>
<span class='va'>rates_indx</span> <span class='op'>&lt;-</span> <span class='fu'><a href='get_prices_from_tickers.html'>get_prices_from_tickers</a></span><span class='op'>(</span><span class='st'>"^GSPC"</span>,
                                      start <span class='op'>=</span