Here are 10 things you should know for Monday, Nov. 23:

Here are 10 things you should know for Monday, Nov. 23:

1. -- U.S. stock futures were pointing lower Monday ahead of data on home sales and as Wall Street awaits the announcement of a mega-merger in the pharmaceutical industry.

European stocks fell, led by declines in commodities stocks on falling raw materials prices.

Asian shares ended Monday's session mostly lower.

2. -- The economic calendar in the U.S. on Monday includes Existing Home Sales for October at 10 a.m. EST.

3. -- U.S. stocks on Friday rose and logged their best week in more than a year after the Federal Reserve signaled more strongly that a hike in interest rates in December is more likely, providing a degree of certainty for equity investors.

The Dow Jones Industrial Average added 3.4% over the week, regaining positive ground for the year in Friday's session. The S&P 500 added 3.3%, and the Nasdaqgained 3.6%. The S&P 500 logged its best week of the year.

4. -- Pfizer (PFE - Get Report) and Allergan (AGN - Get Report) agreed to merge in a deal worth more than $150 billion that would create the world's biggest drugmaker, The Wall Street Journal reported.

The deal would move Pfizer to a foreign country.

The boards of each company ratified the deal Sunday and it could be announced Monday, according to people familiar with the matter, the Journal reported. The final terms include 11.3 Pfizer shares for every Allergan share and the deal also contains a small cash component, the people said.

The takeover would be the largest so-called inversion ever, which allows a U.S. company to move abroad and take advantage of a lower corporate tax rate elsewhere. To help secure the lower tax rate, the deal will be technically structured as a reverse merger, with Dublin-based Allergan, which is smaller, buying New York-based Pfizer, the Journal reported.

Pfizer CEO Ian Read will lead the combined company with Allergan CEO Brent Saunders serving as his No. 2, some of the people told the newspaper.

5. -- Petco is near an agreement to be acquired by CVC Capital Partners and the Canadian Pension Plan Investment Board for $4.7 billion, a person briefed on the matter told the New York Times.

The deal is likely to be announced on Monday.

Petco, which sells food and supplies for pets in 1,400 stores throughout the U.S., has been bought and sold by TPG Capital and Leonard Green & Partners twice, the Times noted. The first time was in 2000, when they acquired the retailer for $600 million, and then took it public two years later. They then bought it back in 2006 for $1.68 billion.

6. -- Diebold (DBD - Get Report) , the U.S. ATM maker, offered to buy German rival Wincor Nixdorf (WNXDY) for $1.8 billion in a cash-and-stock deal.

The merger would create the world's largest maker of automated teller machines.

The companies announced last month they were in exclusive talks.

7. -- Procter & Gamble (PG) , the consumer-products giant, should split, according to Barron's.

P&G is divesting 100 brands to focus on faster-growing products and is cutting costs aggressively, but the stock, down 17% this year, has trailed the S&P 500 for six years, Barron's noted.

A breakup would offer shareholders an opportunity to invest in companies growing from a dramatically smaller base. Barron's figured that P&G's businesses could be worth about $90 a share if they traded separately, compared with a recent stock price of $75. Add a hefty 3.5% dividend yield and investors could realize a total return from a breakup of almost 25%, Barron's noted.

8. -- Ford (F) workers narrowly approved a new four-year contract, wrapping up five months of negotiations between the United Auto Workers union and Detroit automakers.

The UAW said late Friday that Ford's contract passed with a 51.4% vote. The agreement covers 53,000 U.S. hourly workers at 22 plants.

9. -- The Hunger Games: Mockingjay - Part 2 took in $101 million in its first weekend in theaters, according to Rentrak estimates Sunday.

But the latest chapter of The Hunger Games collected the lowest opening take among the four films in the series.

10. -- Earnings are expected Monday from Tyson Foods (TSN - Get Report) and GameStop (GME - Get Report) .